给水管网的阀门在双向流动的管段上,应采用( )。
A.止回阀
B.闸阀
C.蝶阀
D.减压阀
参考答案:B,C
根据句意及所给中文提示或首字母提示,写出句中所缺单词。
小题1:The young woman looks u______. But she is very kind.
小题2:Don’t worry about your illness. You will be c______ soon.
小题3:The doctor hasn’t heard of this kind of _______( 病例 )before.
小题4:Can you teach my father some ________( 技能 )?
小题5:Most of the students in our country are well________ ( 教育) now.
在人体ABO血型中,输血的时候,应以输入 为原则。