【单选题】当y=2cosx-3sinx取得最大值时,tanx的值是( )
【单选题】根据脱氧程度不同,下列钢材中,质量最差的是( )。
【单选题】下列钢材中,脱氧程度和质量最差的是 ( )
【单选题】If there are a number of survivors in the water after abandoning ship,they should().
A.
tie themselves to the unit so they won't drift with the current
B.
form a small circular group to create a warmer pocket of water in the center of the circle
C.
send the strongest swimmer to shore for assistance
D.
form a raft by lashing their life preservers together
【单选题】If a small circular current is placed in a uniform magnetic field, at which angle θ there will be maximum torque acting on the circular current?【图片】
【单选题】下列钢材中,脱氧程度和质量最差的是( )
【单选题】函数y=x-sinx,x∈[ π 2 ,π]的最大值是 ( )