蝴蝶阀的组成？
参考答案：
阀体、活门以及其它附属部件组成。
______ made the school proud was ______ more that 90% of the students had been admitted to key universities.
A．What…because
B．What…that
C．That…what
D．That…because
下列指令中无操作元件的有哪些（）。
A、ALD
B、OLD
C、SI
D、AN
