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【单选题】
正确的滴定方法是A.
左手控制酸式滴定管活塞，大拇指和食指抓住活塞
B.
开始滴定时适当快些，滴定液可以滴下
C.
前后摇锥形瓶，边摇
D.
接近终点时，要一滴一滴地滴入，同时摇匀溶液，若颜色变化至指定颜色，且30s不褪色即为滴定终点
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【单选题】The packages sent by family members __________ by criminal suspects in the detention centre.
A.
can be received directly
B.
can’t be accepted
C.
can’t be received directly
D.
can’t be sent back
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