— Many species are in danger of dying ou

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问题选择题

— Many species are in danger of dying out because of a________of habitat.

— I couldn't agree more.We must take action for them as well as for ourselves. [ ]

A. waste

B. possession

C. pollution

D. lack

答案

答案：D

问答题简答题

汇流环是雷达故障率比较高的部件，如何对汇流环进行检查维护？

单项选择题

洗涤红细胞质量标准要求下列哪种正确：（）

A.红细胞回收率≥70%；白细胞清除率≥80%，血浆蛋白清除率≥98%

B.红细胞回收率≥80%；白细胞清除率≥70%，血浆蛋白清除率≥98%

C.红细胞回收率≥70%，白细胞清除率≥80%，血浆蛋白清除率≥95%

D.红细胞回收率≥75%，白细胞清除率≥80%，血浆蛋白清除率≥98%