当电动控制调节阀的操作开关在（）位置时，不能在站控机和终控机上控制。
A.关断
B.遥控
C.任意
D.就地
参考答案：D
A．He doesn’t enjoy business trips as much as he used to.
B．He doesn’t think he is capable of doing the job.
C．He thinks the pay is too low to support his family.
D．He wants to spend more time with his family.
下列自然现象中，由液化形成的是（ ）
A．屋檐上挂着的冰凌
B．草梗上裹着的白霜
C．荷叶上滚动着的露珠
D．大树上覆盖着的积雪
