There _____ many English books in the library. [ ]
A. is
B. are
C. has
D. have
答案:B
()宜用于大体积混凝土工程。
A.铝酸盐水泥
B.硅酸盐水泥
C.普通硅酸盐水泥
D.矿渣硅酸盐水泥
AzL90-3型计轴设备由室内ACE()和室外EAK30C电子盒、SK30轨道传感器组成。