旋塞阀的特点有( )。
A．构造复杂
B．严密性较差
C．不宜调节流量
D．适于高压介质
参考答案：B,C
—He thinks _______ of others than of himself.
—That's why everyone likes to make friends with him. [ ]
A. much
B. more
C. little
D. less
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