原始治疗性证据的真实性评价，一般要考虑哪些方面？

冷变形是指金属在（）以下进行变形或加工。

A．727℃

B．1148℃

C．再结晶温度

D．都不对

如果是期间超过1年或期间有现金流发生，不应该选择的评估业绩指标是( )。

A．金额加权收益率

B．时间加权收益率

C．内部回报率

D．持有期收益率

小军和小民在用图所示的实验装置完成了“测定滑轮组的机械效率”的实验后，想：在所用滑轮组一定的情况下，它的机械效率与哪些因素有关呢？两人根据各自的生活经验和所学知识提出了多种猜想，经过激烈讨论并虚心听取了其他同学的意见，最后形成了以下两个猜想：

猜想1 可能与提升的速度大小有关；

猜想2 可能与被提升的物体重有关。

小军和小民用图所示的实验装置对上面两个猜想进行了探究，得到的实验数据记录如下表。

（1）请帮助小民完成表中的一项计算；

（2）分析小军和小民的实验数据，得到的实验结论是：在滑轮组一定的情况下，它的机械效率与________有关；它们的关系是：______________。

重症肌无力的主要病理生理机制是（）

A.乙酰胆碱释放量增多

B.乙酰胆碱释放量减少

C.乙酰胆碱受体数目增多

D.乙酰胆碱受体数目减少

E.乙酰胆碱受体抗体减少

The cotton farms of Country Q became so productive that the market could not absorb all that they produced. Consequently, cotton prices fell. The government tried to boost cotton prices by offering farmers who took 25 percent of their cotton acreage out of production direct support payments up to a specified maximum per farm.
The government’s program, if successful, will not be a net burden on the budget. Which of the following, if true, is the best basis for an explanation of how this could be so

A．Depressed cotton prices meant operating losses for cotton farms, and the government lost revenue from taxes on farm profits.

B．Cotton production in several counties other than Q declined slightly the year that the support-payment program went into effect in Q.

C．The first year that the support-payment program was in effect, cotton acreage in Q was 5 % below its level in the base year for the program.

D．The specified maximum per farm meant that for very large cotton farms the support payments were less per acre for those acres that were withdrawn from production than they were for smaller farms.

E．(E) Farmers who wished to qualify for support payments could not use the cotton acreage that was withdrawn from production to grow any other crop.