水泵并联的条件是()。
A、型号相同
B、扬程相等
C、流量相等
参考答案:B
-- Will the weather be all right for our picnic this weekend?
-- No, ______ we are lucky. The newspaper says it’ll be rainy anyway.
A.if
B.as
C.though
D.unless
As the spokeswoman said, ______ we should take action against them depends on what they will do.
A.why
B.if
C.whether
D.that