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【多选题】
按制动系统的制动能源分为A.
人力制动系统：以驾驶员的体力为输入能源的制动系统。
B.
动力制动系统：完全靠发动机的动力转化而成的气压或液压能进行制动的系统。
C.
伺服制动系统：兼用人力和发动机动力的制动系统。
D.
辅助制动系统：汽车下长坡时稳定车速的制动系统。
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举一反三
【单选题】Once ______ of the necessity of a move, he worked hard to find a new home.
A.
convinced
B.
be convinced
C.
convincing
D.
having convinced
【简答题】Once __________ of the necessity of a move, he worked hard to find a new home. A. convinced B. be convinced B. convincing D. having convinced
【简答题】A．He is an honest, flexible and easy-going person. B．He worked once as an administration personnel. C．He is a salesman and this time he is selling himself. D．He has just lost his job and is hunting fo...
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