柴油打夯机填涂施工时,分层厚度为( ),每层压实遍数为3~4。
A.<200 mB.200~250mmC.250~350mmD.250~300mm
参考答案:B
I have no doubt in my mind _______ they will be glad to see me.
A.that
B.how
C.why
D.whether
风力发电机组的工作状态有哪些?