细菌性 * * 病的分泌物为（）
A.黄色泡沫状稀薄白带
B.灰色鱼腥味白带
C.乳凝块状白带
D.脓性白带
E.水样白带有臭味
参考答案：B
Either you or one of your students _______to attend the meeting that will be held tomorrow.
A． are
B．is
C．have
D． be
简述更换应答器注意事项。
