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【多选题】
材料经过无限次 载荷作用而不发生断裂的最大应力，称为 ，用符号 表示。A.
交变
B.
疲劳强度
C.
σ -1
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【单选题】Many men become workaholics, ______success and often neglecting their wives and children
A.
chasing
B.
following
C.
catching
D.
fighting
【简答题】Many children become easily attached to some _____ object, such as a blanket or soft toy.
【简答题】One mistake that schools and parents often make is to think thatit'S not necessary to teachtraffic laws( 交通法规 )until the child is old enough to drive a car . Some children die in traffic onbikes befor...
【简答题】One mistake that schools and parents often make is to think that it's not necessary to teach traffic laws (交通法规) until the child is old enough to drive a car. Some children die in traffic on bikes bef...
【单选题】_______ in the war, many children have become orphans(孤儿).
A.
Their parents were killed
B.
Being killed
C.
Their parents killed
D.
Killed
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