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问题 单项选择题

妊娠期间应慎戒房事，必须避免房事的时间是：

A．妊娠1个月以内和9个月以后
B．妊娠1个半月以内和8个半月以后
C．妊娠2个月以内和8个月以后
D．妊娠2个半月以内和7个半月以后
E．妊娠3个月以内和7个月以后

答案

参考答案：E

单项选择题

Which of the following definitions used in accounting for income taxes is least accurate （）

A. An income tax expense is an expense resulting from current period pretax income and change in deferred taxes. 

B. A valuation allowance is a reserve against deferred tax assets based on the likelihood that those assets will not be realized.  

C. A deferred tax liability is a balance sheet amount related to the difference between tax expense and taxes payable that is expected to be recovered from future operations
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多项选择题

根据GB/T12243-2005《弹簧直接载荷式安全阀》的规定：关于安全阀结构的说法是哪些正确的的（）

A、全启式安全阀应有限制开启高度的机构

B、整定压力大于3.0MPa的蒸汽用安全阀排出的介质不能直接冲蚀弹簧

C、介质温度大于235℃的空气或其他气体用安全阀排出的介质不能直接冲蚀弹簧

D、蒸汽用的安全阀应带有扳手
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