在“问题答案”的修改中提升答题能力——关于古诗阅读复习的一次有益尝试

一些高考古诗阅读题的参考答案存在着重复啰唆、条理性差、要点缺失等问题,作者以这类试题的＂问题答案＂为教学切入点,引领学生理性审视和修改＂问题答案＂,通过比照＂问题答案＂与修改后的答案,让学生归纳出答题步骤、语言表述模式和确定答案要点等解答古诗阅读题的方法,以实现＂问题答案＂的正向迁移。

Microstructure and mechanical properties of strontium-modified ADC12 alloy processed by heat treatment

The effects of heat treatment and strontium （SO addition on the microstructure and mechanical properties of ADC12 alloys were investigated, and two-stage solution treatment was introduced. The results indicated that the addition of Sr obviously refined the microstructure of ADC12 alloys. When 0.05 wt% Sr was added into the alloy, the eutectic Si phase was fully modified into fine fibrous structure; a-A1 and fl-A15FeSi phases were best refined; and the eutectic AlzCu phase was modified into block-like AlzCu phase that continuously distributed at the grain boundary. The ultimate tensile strength （UTS） （270.63 MPa） and elongation （3.19%） were increased by 51.2% and 73.4% respectively compared with unmodified alloys. After the two-stage solution treatment （500 ~C, 6 h＋520 ~C, 4 h）, for 0.05 wt% Sr modified ADC12 alloys, the Si phases transformed into fine particle structure and AlzCu phases were fully dissolved. The peak hardness value of the alloys processed by the two-stage solution treatment was increased by 8.3% and 6.8% respectively compared to solution treatment at 500 ~C and 520 ~C. After the aging treatment （175 ~C, 7 h）, the hardness and UTS were increased by 38.73% and 13.96% respectively when compared with the unmodified alloy.

Upper bound solution for supporting pressure acting on shallow tunnel based on modified tangential technique

Based on the nonlinear failure criterion and the upper bound theorem, the modified tangential technique method was proposed to derive the expression of supporting pressure acting on shallow tunnel. Instead of the same stress state, different normal stresses on element boundaries were used. In order to investigate the influence of different factors on supporting pressures, the failure mechanism was established. The solution of supporting pressure, with different parameters, was obtained by optimization theory. The corresponding failure mechanism and numerical results were presented. In comparison with the results using the single tangential technique method, it is found that the proposed method is effective, and the good agreement shows that the present solution of supporting pressure is reliable.

The Innovations and Shortages of the New Budget Law

The introduction of the new budget law is one of the most important achievements of the construction of national legal system. It is a landmark event in building financial system. The new budget law has made a lot of breakthroughs and innovations in the budget managemenL to lead direction for further deepen fiscal reform. However, the modification of the budget law can only adopt the principle of limited modification, there are still many problems. This paper discusses the innovation and deficiency of the new budget law under the background of budget law modification, and makes suggestions to further improve the budget law.

Applicability of Modified Vialit Adhesion Test for Seal Treatment Specifications

The objective of this paper is to evaluate the Vialit Adhesion Test and its potential for use within performance oriented specifications for seal treatments. Multiple aggregates and emulsions are evaluated with existing test methods and with modified equipment and methods. The results indicate the current test tray is inadequate and that a thicker tray provides better results. Conditioning that incorporated either freeze times between 4 to 8 hours and/or freeze thaw cycles were also found to be improvements to the current conditioning methods. The specified mass of the steel spheres used during the test may be too restrictive in that more economical spheres were tested and did not show differences in aggregate loss.