对讲机的音量调节，顺时针（），音量逐渐（），反之（）。
参考答案：旋转旋钮；增大；减弱
－Does the young man standing at the gate_____ the car?
－No. The car is _____ his father.[ ]
A. in possession of ；in the possession of
B. have possession of; take possession of
C. have possession of; in the possession of
D. in the possession of; in possession of
下列化学方程式书写正确的是
A．Al+3H2SO4=Al2(SO4)3+3H2↑
B．Cu + O2CuO
C．2Fe + O22FeO
D．4P+5O22P2O5
CuO
2FeO