从5位工人中选2人，分别担任保管员和质量监督员，则不同的选法共有

A {x|-1≤x<2) B {x|-2<x<2) C {x|-2<x<5) D {x|-1≤x<5)．

A 第一象限角 B 第二象限角 C 第三象限角 D 第四象限角

A y=sin2x B y=x2 C y=tanx D y=cos3x

A 31 B 25 C 24 D 13

A 4π B 2π C π D <img src="https://www.beizhujiaoyu.com/uploads/202208/164672762926361.png" width="15" height="26" /> 

A 甲是乙的必要条件但不是充分条件 B 甲是乙的充分条件但不是必要条件 C 甲是乙的充要条件 D 甲既不是乙的充分条件也不是乙的必要条件

A y=x2+x B <img src="https://www.beizhujiaoyu.com/uploads/202208/164672763411861.png" width="79" height="19" />  C <img src="https://www.beizhujiaoyu.com/uploads/202208/164672763842121.png" width="80" height="33" />  D y=cosx

A {x|x>2} B {x|x<0} C {x|0<x<2} D {x|x<0或x>2}

A <img src="https://www.beizhujiaoyu.com/uploads/202208/164672764628081.png" width="132" height="32" />  B <img src="https://www.beizhujiaoyu.com/uploads/202208/164672765082321.png" width="133" height="33" />  C <img src="https://www.beizhujiaoyu.com/uploads/202208/164672765477631.png" width="115" height="32" />  D <img src="https://www.beizhujiaoyu.com/uploads/202208/164672765867071.png" width="115" height="32" /> 

A 1 B 2 C 4 D <img src="https://www.beizhujiaoyu.com/uploads/202208/164672766323291.png" width="30" height="18" />