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【单选题】
喉嘴面积比较大的喷射泵工作中最大的水力损失是( )损失。A.
喷嘴
B.
混合
C.
混合室进口和摩擦
D.
扩压
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举一反三
【单选题】对于原癌基因激活机制中基因易位的叙述,错误的是
A.
可在染色体易位过程中发生
B.
原癌基因移至强启动子下游附近
C.
原癌基因移至强增强子附近
D.
强启动子插入原癌基因
E.
原癌基因移至强启动子上游附近
【单选题】Two equal charges of magnitude + 1 C are separated by a distance of 1 km. What is the force acting between these two charges?
A.
9 N
B.
90 N
C.
900 N
D.
9000 N
【单选题】Two charged objects are separated by a distance d. The first charge is larger in magnitude than the second charge.
A.
The first charge exerts a larger force on the second charge.
B.
The second charge exerts a larger force on the first charge.
C.
The charges exert forces on each other equal in magnitude and opposite in direction.
D.
The charges exert forces on each other equal in magnitude and pointing in the same direction.
【判断题】Newton’s Third Law is that when two objects interact, the forces are always equal in magnitude, opposite in direction, and applied on them, not one only.
A.
正确
B.
错误
【单选题】If the magnitude of the sum of two vectors is less than the magnitude of either vector, then:
A.
the scalar product of the vectors must be negative
B.
the scalar product of the vectors must be positive
C.
the vectors must be parallel and in opposite directions
D.
the vectors must be parallel and in the same direction
E.
none of the above
【单选题】工程量计算规范中规定,()是沟槽,()是基坑,超出上述范围则为一般土方。
A.
底宽≤7m且底长≤3倍底宽,底长≤3倍底宽且底面积≤150㎡
B.
底宽≤7m且底长>3倍底宽,底长≤3倍底宽且底面积≤150㎡
C.
底宽≤7m且底长>3倍底宽,底长≤3倍底宽且底面积>150㎡
D.
底宽≤7m且底长≤3倍底宽,底长>3倍底宽且底面积≤150㎡
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