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问题 单项选择题

在采用格式条款的合同中，提供格式条款一方免除自己的责任、加重对方责任、排除对方权利的，该条款（）。

A.经公证后有效

B.经过仲裁机构认定后无效

C.有效

D.无效

答案

参考答案：D

单项选择题

Microwave communication uses high-frequency (56) waves that travel in straightlines through the air. Because the waves cannot (57) with the curvature of the earth, they can be (58) only over short distance. Thus, microwave is a good (59) for sending data between buildings in a city or on a large college campus. For longer distances, the waves must be relayed by means of "dishes" or (60) .These can be installed on towers, high buildings, and mountain tops.

A．reflex

B．distort

C．bend

D．absorb
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单项选择题

用电容式液位计测量导电液体液位时，以下说法正确的是（）。

A.介电常数不变，液位变化时电极面积变化

B.介电常数变化，液位变化时电极面积不变

C.介电常数不变，液位变化时电极面积不变

D.介电常数变化，液位变化时电极面积变化
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