配比型电子皮带秤控制系统以通过主秤的物料瞬时流量为基准，与掺

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问题单项选择题

配比型电子皮带秤控制系统以通过主秤的物料瞬时流量为基准，与掺配称量装置相对应的设定掺配（）运算后，作为该掺配装置的设定流量。

A.质量

B.重量

C.比例

D.流量

答案

参考答案：C

阅读理解

Read and judge. （阅读对话，判断对“√”错“×”）

A: Hey! Look at that dress. It's pretty！

B: Yes, it is. How much is this dress?

Assistant: It's eighty-nine yuan.

B: Oh, that is expensive. How about that one?

Assistant: It's twenty yuan.

( )1. The first dress is very cheap.

( )2. The first dress is very pretty.

( )3. The second dress is 30 yuan.

( )4. The first dress is 88 yuan.

问答题简答题

衡量天线性能的参数主要有哪些？