水泥浆中固相颗粒直径5~30μm的占15%左右,多数砂岩孔喉直径小于此值。
参考答案:错
妊娠合并生殖道生殖器疱疹治疗选用()
A.青霉素
B.第三代头孢菌素类
C.盐酸四环素
D.阿昔洛韦
E.红霉素
It’s better to teach the people out of work means to earn money( ) to provide money for them.
A.than
B.as
C.most
D.more