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【单选题】
判别下列荷载中哪些属于活荷载?I.土压力;II.风荷载;III.积灰荷载;IV.结构自重A.
I、 Ⅱ
B.
Ⅲ、Ⅳ
C.
I、Ⅳ
D.
Ⅱ、Ⅲ
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Which vein does not belong to The Tributaries of the Great saphenous v.?
A.
Superficial medial femoral v.
B.
Superficial lateral femoral v.
C.
External pudendal v.
D.
lesser saphenous veins
【简答题】自催化反应过程的最优循环比 自催化反应 A+P→P+P k=1L/(mol·min)，在循环反应器中进行反应，F A0 =1mol/min，c A0 =1mol/L，c P0 =0，转化率为0.99，求： (1)最优循环比下的反应器体积； (2)当循环比为R=4时反应器体积； (3)R=∞时，反应器体积； (4)R=0时，反应器体积。
【单选题】V irtual organizations has many character, which is not belong to virtual organizations ?
A.
fluid
B.
flexible
C.
constantly changing
D.
diversity
【简答题】美学之父是谁?
【多选题】which substances belong to vitamin V
A.
retinoic acid
B.
retinal
C.
retinol
D.
beta carotene
【单选题】【单选】A passenger vessel is underway. When may passengers visit the pilothouse?
A.
passengers are excluded from the pilothouse while underway
B.
passengers are permitted in the pilothouse during daylight hours only
C.
passengers are permitted to visit the pilothouse when authorized by the master and officer of the watch
D.
passengers are permitted in the pilothouse when they are escorted by a ship’s officer
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