乳化炸药和水胶炸药的主要成分是()
A.硝酸铵
B.硝酸铵的饱和水溶液
C.食盐
D.硝酸钾
参考答案:B
I have a (an) ______ friend, and he is from Canada. [ ]
A. speak English
B. English-speaking
C. speaking-English
D. to speak English
板桩码头中,锚碇板一般是预制钢筋混凝土板块,当板块为间隔设置时,称为()。
A.锚碇梁
B.锚碇板桩
C.锚碇板
D.锚碇墙