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以下哪个字符不是表示通信设备的电源正极接线柱（）
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下面作者和作品连线正确的是（）
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货币薪酬又称()。
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不属于大学生学习动机特点的是（）。
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刚性基础一般用钢筋混凝土材料。()
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Every country has traffic rules and signs, but are they the same? In most countries, there are street and road signs with 21________ about location,directions,dangers,cautions, and rules of the road. These 22 _________ tell drivers and pedestrians what to do and what not to do,including speed and parking 23 ________,places to stop,when to make turns,and other 24________.However, specific local traffic laws and practices usually differ around the world. For instance, in Japan, Indonesia, South Africa, the United Kingdom, and other countries ,steering 25________are on the right side of vehicles ,and cars and trucks drive on the left side of the road. In other 26 _________,such as the United States,Saudi Arabia,Italy, and Mexico,steering wheels are on the left side of vehicles ,and cars and trucks 27________on the right side of the road. An illustration of a local 28________law is the regulations for pedestrian and school 29 ________ in some Mexican cities:drivers rarely respect the rules,so for safety, people cross streets only at stop lights, on roads with little traffic, or on pedestrian-only 30 _________ across wide avenues.
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凝血酶可以激活（）
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《煤矿安全规程》第八十八条规定：开采冲击地压煤层时，停产（）天以上的采煤工作面，恢复生产的前一班内，应鉴定冲击地压危险程度，并采取相应的安全措施。
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引起大气运动的根本原因是：（）
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镁铝榴石有（）包裹体。