Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?()
A. To allow for greater expansion due to higher operating temperature
B. To seal the cylinder against leakage of combustion gases
C. To provide an additional surface for oil cooling
D. To provide an additional strength for the crown and lower structure
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LC主触头虚接、励磁机L或主发电机F的励磁绕组断路时,会造成主发电机无电压、电流。
A. 正确
B. 错误
会员制期货交易所召开会员大会,应当将会议审议的事项于会议召开()前通知会员。
A. 5日
B. 7日
C. 10日
D. 15日
分散片的主要特点是(),体内生物利用度高;适于剂量较大且口服不宜吞服的制剂。