双进双出磨的优点有（）。
A、可靠性高、可用率高；
B、出力稳定；
C、储粉能力强；
D、显著的灵活性。
参考答案：A, B, C, D
______around the university, we then were taken to a building, ______ many scientists worked.
A．Showing; where
B．Having been shown; where
C．Having shown; which
D．Being shown; that
茉莉花花语是（）。栀子花的花语是（）。
