The basic American handshake______.
A.can be done with either the right hand or the left hand
B.is complicated and difficult to follow
C.is often done by people at an old age
D.can be done between old or new friends
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During the medieval times, if one man covered in armor extended an open hand to another, ______.
A.the same gesture would definitely be returned
B.he was sending a signal of friendship
C.he would receive a dagger or sword
D.he was asking for a weapon
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多个样本均数之间的两两比较需用哪种方法
A.t检验
B.t'检验
C.方差分析
D.正态性检验
E.q检验
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抑制性突触后电位是
A、去极化局部电位
B、超极化局部电位
C、具有全或无特征
D、突触前膜递质释放减少所致
E、突触后膜对Na+通透性增加所致
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【C13】
A.reckons
B.reflects
C.realizes
D.remarks
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【C7】
A.evidence
B.threat
C.risk
D.hint
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