在“天坠未形,冯冯翼翼”中,“坠”之义为()
A.坠落
B.队列
C.地
D.下
参考答案:C
A.It was great. B.What’s the matter C.How about the green one D.Are you free tomorrow E.Thanks,but I am full.
A:Helen. The happy weekend is coming.______ B:Yes. I’m not busy at all. I’ve already finished my homework.
用来切断或接通管道介质的阀门是()。
(A)止回阀
(B)旋塞阀
(C)安全阀
(D)截止阀