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【单选题】
当多台塔式起重机在同一施工现场交叉作业时，应编制专项方案，并应采取防碰撞的安全措施。任意两台塔式起重机之间的最小架设距离应符合下列规定（）。A.
低位塔式起重机的起重臂端部与另一台塔式起重机的塔身之间的距离不得小于0.6m
B.
高位塔式起重机的最低位置的部件（吊钩升至最高点或平衡重的最低部位）与低位塔式起重机中处于最高位置部件之间的垂直距离不得小于2m
C.
低位塔式起重机的起重臂端部与另一台塔式起重机的塔身之间的距离不得小于1.5m
D.
起重臂最低点应比低塔塔尖高0.6米
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A.
驾驶员通过中央操纵机构发出操纵指令，由传动机构将其传到舵面
B.
驾驶员操纵中央操纵机构直接驱动舵面
C.
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D.
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A.
invented
B.
introduced
C.
developed
D.
delivered
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A.
α1-Antitrypsin deficiency
B.
Chronic alcohol abuse
C.
Hepatitis E viral infection
D.
Hereditary hemochromatosis
E.
Primary sclerosing cholangitis
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【单选题】国外研究人员发现，叶酸可引发癌细胞凋亡，对癌细胞的基因表达有一定影响，故属于一种天然抗癌维生素。 以下哪项如果为真，最能反驳以上观点?( )
A.
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B.
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C.
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D.
叶酸不易被人体吸收
【单选题】实际 GDP是通过（ ）得到的。a．当期GDP乘以GDP缩减指数； b．当期GDP除以GDP缩减指数；c．当期GDP乘以基期价格； d．当期GDP除以基期价格。
A.
b
B.
b
C.
c
D.
d
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