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问题 填空题

输血时应以输入________血为原则。在情况紧急时，任何血型的人都可以输入少量的______型血。

答案

同型血   O型

选择题
It is reported that many a new house _____ at present in the disaster area.

A. are being built
B. were being built
C. was being built
D. is being built
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单项选择题

进一步规范和完善直流保护装置检修流程和方法，严控直流保护软件修改，（）通过软件置位检查回路的检修行为。

A.可以

B.杜绝

C.必须
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