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【单选题】
超声波法破碎细胞的主要原理是A.
研磨作用
B.
空穴作用
C.
脱水作用
D.
机械碰撞
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
正确
B.
错误
【单选题】Having grown up in a children’s home, I have great____with little kids.
A.
empathy
B.
repentance
C.
frustration
D.
outburst
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