混凝土和砂浆用再生细骨料按性能要求分为几类?()
A、二类
B、三类
C、四类
D、无分类
参考答案:B
在Internet上,通过()协议之间的配合进行数据的传送。
A.SMTP
B.TCP
C.IPX
D.IP
Deep-draught vessels and VLCCs shall allow for()of at least 3.5 m at all times during the entire passage through the Straits of Malacca and Singapore.
A.a draft
B.a freeboard
C.an air draft
D.an under-keel clearance