水平差和三角坑是（）。A、同一性质钢轨水平误差 B、水平差是钢轨水平误差，三角坑不是

7.95保留一位小数______．

—Can you come on Monday or Tuesday?

—I 'm afraid ________ day is possible.

A．either

B．neither

C．some

D．any

列入《出入境检验检疫机构实施入境验证的进口商品目录》内的进口商品，海关在办理通关手续时需加验检验检疫机构签发的《入境货物通关单》。 ( )

Fair and(1)competition in govemment procurement around the world is good business and good public policy.Competitive pricing,product(2)and performance improvements result from competitive practices and help ensure that government authorities get the best(3)for the public they serve.

空白（1）为（）

A.open

B.continue

C.dependent

D.reliable

膜剂的制备关键是（）

A.成膜材料胶浆的配制

B.加入药物、附加剂等

C.脱泡（除气泡）

D.涂膜

E.干燥