1GL等于（）A.2Proof B.3Proof C.4Proof D.5Proof

下列关于蛋白质的叙述中不正确的是

A．鱼、鸡蛋、牛奶、葡萄等食物的主要营养成分是蛋白质

B．通过盐析可以分离、提纯蛋白质

C．天然蛋白质水解可以得到α—氨基酸

D．蛋白质遇重金属盐时会发生凝结，失去原来的活性，所以误食重金属盐能使人中毒

M: There is a non-stop train for Washington and it leaves at 2:30.
W: It’s faster than the 2 o’clock train. Besides, we can have something to eat before getting on the train.
Q: What do we learn from the conversation().

A. The 2:00 train will arrive earlier.

B. The 2:30 train has a dining car.

C. The woman prefers to take the 2:30 train.

D. They are going to have some fast food on the train.

仓储作业有怎样的安全特性？

Word2000窗口下，要在文档中制作艺术字，使用( )菜单中的命令。

A．编辑

B．插入

C．工具

D．格式

防治混凝土折板隔墙门框固定不牢的措施是什么？