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【单选题】
图4-11所示一绞盘有三个等长为，的柄，三个柄均在水平面内，其间夹角都是1200°如在水平面内，每个柄端分别作用一垂直于柄的力F1、F2、F3，且有Fl=F2=F3=F，该向O点简化后的主矢及主矩为（ ）。A.
0.01
B.
0.07
C.
0.05
D.
0
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】关于抗精神病药物奥兰扎平(奥氮平)临床应用的正确描述为
A.
对精神分裂症阳性、阴性症状以及认知功能障碍和伴发的抑郁症状有效
B.
对血象无明显影响
C.
其半衰期长，故可一日一次给药
D.
锥体外系反应少见，治疗依从性较好
E.
主要副作用为引起头晕、思睡、便秘、体重增加等
【单选题】If he _______ driving like that , he'll have a crash.
A.
keeps
B.
kept
C.
keep
D.
have kept
【单选题】He plans to have a__________ vacation. He thinks he'll be__________ when he returns. [ ]
A.
relaxing; relaxing
B.
relaxing; relaxed
C.
relaxed; relaxed
D.
relaxed; relaxing
【单选题】________ he stops driving himself like this, he'll have a breakdown.
A.
Until
B.
Once
C.
Since
D.
Unless
【简答题】A．He'll miss the meeting that afternoon. B．He'll have an appointment with the host. C．He won't miss the meeting. D．He is very hardworking.
【单选题】He’ll have the book ______ soon. have sb do sth/have sth done
A.
completed
B.
complete
C.
completing
D.
to be completed
【多选题】关于精神性头晕的正确描述：
A.
是由精神疾患引起
B.
可以表现为漂浮感、摇摆感、游泳感、眼花感、内在旋转感、脱离躯体感
C.
有头晕主诉，也可以跌倒
D.
可在应激、疲劳或进行日常活动时加重
E.
迷路疾患痊愈后出现的头晕不属于精神性头晕
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