硅酸盐水泥适用于( )。
A.受化学浸蚀的工程 B.受海水浸蚀的工程C.大体积混凝土工程 D.需快硬早强的工程
参考答案:D
So difficult _____ it to adjust to an English-speaking environment that he determined to learn English hard.
A.he has felt
B.has he felt
C.he did feel
D.did he feel
调节睾丸雄激素分泌功能的是()
A.LH(或称ICSH)
B.FSH
C.孕激素
D.雌激素
E.前列腺素