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【单选题】
真空助力伺服制动系主缸助力原理是利用( )压力差实现的。A.
大气压与发动机进气管负压
B.
储气筒压缩高压气体与大气压
C.
压缩高压气体与进气管负压
D.
以上都可以
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】喉癌分型正确的是 C A会厌癌 声门癌 喉咽癌 B喉室癌 梨状窝癌 声门癌 C 声门上癌 声门癌 声门下癌
【单选题】What happened one night?
A.
The dog fell iii and barked all night long.
B.
The dog played a trick on the speaker.
C.
The dog awakened the speaker and led him to help its master.
D.
The speaker had a nightmare in which he saved his neighbour's life.
【单选题】In the polar regions, the dog mainly ______.
A.
carried supplies
B.
provided companionship
C.
tracked prey
D.
herded caribou(驯鹿)
【单选题】肿瘤发生、发展的三个阶段是
A.
癌前病变，原位癌，浸润癌
B.
癌前状态，癌前病变，原位癌
C.
临界癌，早期癌，浸润癌
D.
癌前病变，临界癌，原位癌
E.
癌前状态，临界癌，早期癌
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