单选题
发布日期:2021-03-22
prevent piston side thrust
prevent engine friction losses
transmit heat from the piston to the cylinder liner
remove oil from the cylinder combustion space
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计算二重积分 其中积分区域D={(x,y)|x2+y2≤π}。
已知文法G[E]: E→T|E+T|E-TT→F|T*F|T/FF→(E)|I 该文法的句型T+T*F+I的最左素短语为__(1)__,句柄为__(2)__。 空白(1)处应选择()
书写病室报告时,首先报告的是()。
两性离子型表面活性剂()
保险代理从业人员最基本的职业道德是()。
某放射性样品的初始活度为16毫居里,核素半衰期为4小时,几小时后活度变为2毫居里()。
FRA合约的结算金采取现金方式进行交割。
剪刀步态是小儿麻痹后遗症常有的步态。
对于超渗产流,一次降雨所产生的径流量取决于( )。
以下关于操作风险监管资本计量的说法,正确的有()。
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