含多种皂苷及菊糖（）
A．龙胆
B．石菖蒲
C．川贝
D．桔梗
E．黄芩
参考答案：D
It didn’t _____ him that she would refuse his invitation
A．happen to
B．adjust to
C．belong to
D．occur to
E5015焊条要求采用（）。
A、直流反接
B、直流正接
C、交流电源
D、交直流均可
