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【单选题】
四类常用酸型防腐剂中,我国目前普遍采用的下列当中的哪一种?
A.
苯甲酸及其盐
B.
山梨酸及其盐
C.
丙酸及其盐
D.
脱氢醋酸
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A.
三栏式
B.
多栏式
C.
数量金额式
D.
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A.
具体归属
B.
联系方式
C.
本人照片
D.
本人称呼
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A.
Saturday
B.
Sunday
C.
Monday
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A.
wait()
B.
sleep()
C.
yield()
D.
synchronized(this)
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【单选题】________ is not a recommendation for classroom conversation, it is essential.
A.
accuracy
B.
fluency
C.
spontaneity
D.
efficiency
【判断题】一旦病儿的呼吸、心跳停止,当务之急就是要立即实施人工呼吸、心外按压等急救措施。
A.
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B.
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