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【单选题】
设 是 矩阵,若( ),则 有非零解。
A.
B.
C.
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【单选题】The boys often play ____________ football and the girls often play ____________ violin. [     ]
A.
the, /
B.
the, the
C.
/, the
D.
/, /
【单选题】The boys often play soccer _____ every Sunday afternoon.
A.
in
B.
at
C.
/
D.
on
【单选题】The boys often play() football on Sundays.
A.
the
B.
不填
C.
a
【单选题】The boys often play___ guitar in __afternoon.
A.
the; /
B.
/;the
C.
the; the
D.
/;/
【单选题】The boys often play _____ football in _____ afternoon.
A.
/; an
B.
the; an
C.
/; the
D.
a; the
【单选题】导线外业测量不包括 ( )
A.
测边
B.
转折角测量
C.
定向
D.
坐标方位角的推算
【单选题】导线外业的测量工作不包括()
A.
选定并埋设导线点
B.
导线转折角的测量
C.
导线边长丈量
D.
导线角度闭合差的计算
【单选题】The boys often play football in the park on Sunday, ______ they?
A.
are
B.
aren't
C.
do
D.
don't
【单选题】The boys often play _________ basketball after school.
A.
/
B.
a
C.
an
D.
the
【单选题】--- Where the boys often play games? --- In the park.
A.
are
B.
is
C.
does
D.
do