如果有一个长度为2K字节的文本块要存入某一字段，则该字段的数据类型应是A．字符型 B

凸轮控制器控制的起升机构，为什么在重载起吊过程中不允许将控制器手柄在第一档停留？

一个袋中装有2个红球和3个白球，现从袋中任意取出一球，记录下颜色后放回袋中，再任意取出一球，记录下颜色，则取出的两球为不同颜色的概率为______．

对单纯疱疹病毒致病性的错误叙述是（）。

A.病人和健康带菌者为传染源

B.主要通过接触途径传播

C.HSV-2主要通过性传播

D.婴幼儿感染HSV-1多无临床表现

E.免疫低下者在原发感染后形成潜伏感染

按要求完成下列各句。

1. The man is talking with a lady.  He gave us a talk last week.(合并为一句)

    The man _______ gave us a talk last week _______ _______ with a lady,

2. Whatever he says, I don't believe him.(改为同义句)

    _______ _______ What he says, I don't believe him.

3. My father often made me do a lot of homework at the weekends.(改为被动语态)

    I _______ _______ _______ _______ do a lot of homework at the weekends.

4. Stamps are used for sending letters.(对画线部分提问)

    _______ _______ stamps _______ for?

5. The train had left when I got to the train station.(改为同义句)

    The train had left _______ _______ _______  I got to the train station.

调料具有哪些理化性质？对盛装器皿的要求是什么？