从两相干光源s1与s2发出的相干光，在距s1、s2等距离d的p点相遇。若s2位于真 空中，s1位于折射率为n的介质中，p点位于界面上，s1和s2到p点的光程差为( )。
A. ( nd
B. ( (n-1)d
C. ( (n+1)d
D. ( d
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在下列FORTRANN77运算符中，优先级最高的是( )。
A. ( .AN
B. ( .NO
C. ( .O
D. ( .E
Which word best describes the man
Apologetic.
B. Reasonable.
C. Pathetic.
D. Fault-finding.
Which of the following is NOT the result of a tornado
A. Insects are unable to balance themselves.
B. It is difficult to breathe.
C. A tornado destroys everything on its path.
D. A tornado kills 120 people every time it comes.
四种物质正戊烷、新戊烷、异戊烷和正丁醇的分子量相近，其沸点由高到低的正确排列次序是( )。
A. ( 正戊烷＞异戊烷＞新戊烷＞正丁醇
B. ( 正丁醇＞正戊烷＞新戊烷＞异戊烷
C. ( 正丁醇＞正戊烷＞异戊烷＞新戊烷
D. ( 正丁醇＞新戊烷＞异戊烷＞正戊烷
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