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【单选题】
衡量脆性材料的强度指标一般是 。A.
屈服极限
B.
抗拉强度极限
C.
疲劳强度极限
D.
条件屈服极限
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举一反三
【单选题】He comes to school early every day. He is _____ late for school. [ ]
A.
usually
B.
never
C.
often
D.
always
【单选题】At the end of each month when he comes back from school he will be asked by his strict father to ___________ where every cent goes.
A.
watch over
B.
put forward
C.
account for
D.
set off
【单选题】—John never comes to school late. —______. He always come to school first in the class. [ ]
A.
So is he
B.
So he is
C.
So he does
D.
So does he
【单选题】I don’t know if Mike _______to my school tomorrow. If he____, I will be very happy.
A.
comes; comes
B.
came; will come
C.
will come; comes
D.
will come; came
【单选题】Peter is never late for school, ____ he? _____. He always comes on time.
A.
is, Yes
B.
isn’t, No
C.
is, No
D.
isn’t, Yes
【简答题】计算第一型曲线积分的关键是判別()的方程形式,其次是确定积分变量的取值范围
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