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问题 单项选择题

木材具有良好的抗弯强度，一般弯曲强度是顺纹抗压强度的（）倍，这是木材的重要性质。

A、1.5～2

B、2.5～3

C、3.5～4

D、4.5～5

答案

参考答案：A

单项选择题

Cross-sectional returns studies contend that:（）

A. all securities should have equal risk-adjusted returns because security prices should reflect all public information that would influence the security’s risk.

B. all securities should have equal risk-adjusted returns because security prices should not reflect all public information that would influence the security’s risk.

C. securities should not have equal risk-adjusted returns because security prices should not reflect all public information that would influence the security’s risk.
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单项选择题

我国规定，连续三个月内接受的总剂量当量不得超过年剂量当量的

A．20%
B．30%
C．40%
D．50%
E．60%
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