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【单选题】
若把全部产品分为合格品与不合格品,所采用的标志属于( )A.
不变标志
B.
是非标志
C.
数量标志
D.
无法判断
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反馈参考答案：
举一反三
【简答题】塑件上设计 圆角的作用有哪些?
【简答题】How did Jobs feel after being fired by the company?
【简答题】How did Jobs revolutionize common household tools such as phone?
【简答题】What happened to Jobs in the 1980s? How did Jobs describe this ?
【单选题】How did the speaker manage to see Steve Jobs?
A.
By sending postcards again and again.
B.
By phoning again and again.
C.
By sending FedExs and calling again and again.
D.
By sending FedExs again and again.
【单选题】How did Steve Jobs’ attitude to the speaker change?
A.
From impatient to careful.
B.
From unfriendly to kindly.
C.
From inattentive to interested.
D.
From doubtful to hospitable.
【多选题】塑件制品尽可能作圆角设计,包括以下哪些原因?
A.
制品的尖角既不安全，又容易产生应力开裂。
B.
降低应力集中，提高塑件制品的结构强度。
C.
成品更易于顶出
D.
圆角有利于模具加工和模具强度。
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