皮皮学，免费搜题
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【单选题】
添加用户组使用的命令是 ( )A.
groupadd
B.
newgrp
C.
useradd
D.
userdel
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The specialist is______.
A.
a man whose job is to train other people
B.
a man who has been trained in more than one field
C.
a man who can see the forest rather that the trees
D.
a man whose concern is mainly with technical or professional matters
【单选题】Why is Song Jian always nervous when he speaks English?
A.
He does not know the grammar
B.
He can not find a good topic
C.
He sometimes make mistakes
【简答题】经理亲自出马参加面试。 (in person)
【简答题】汉译英:经理亲自出马参加面试
【简答题】简述局部麻醉药的作用机制。
【单选题】The man is not sure if they got the letter but he thinks so .
A.
they got the letter
B.
the man is not sure
C.
the man is not sure if they got the letter
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