单项选择题

闭合导线水平角观测,一般应观测( )。 A.
内角 B.
外角 C.
左角 D.
右角

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单项选择题

Perils of the sea, such as vessel being stranded or grounded covered in an insurance policy are one kind of ( ).

A.natural calamities
B.fortuitous accidents
C.general extraneous risks
D.special extraneous risks