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【多选题】
根尖倒预备的目的包括( )A.
彻底清理和成形根管尖端 3mm
B.
创造可以容纳倒充填材料的空腔
C.
有一定的固位形
D.
剩余牙体组织要有一定的抗力形
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反馈参考答案：
举一反三
【单选题】中国银行、工商银行、建设银行、农业银行等四大行发行的信用卡品牌分别为（ ）
A.
长城卡、龙卡、金穗卡、牡丹卡
B.
龙卡、长城卡、牡丹卡、金穗卡
C.
长城卡、牡丹卡、龙卡、金穗卡
D.
牡丹卡、长城卡、龙卡、金穗卡
【简答题】-- Has he finished his essay? -- I don't know. He _________it this morning.
【单选题】I haven't finished my homework yet._____________.
A.
so has he
B.
Neither he has
C.
He has too
D.
He hasn't either
【单选题】— Has he finished the work? — No, he hasn't. It is ______ work that he can't do it without any help. [ ]
A.
so hard
B.
so a hard
C.
such a hard
D.
such hard
【简答题】完形填空。 Suppose (假定) every person on Earth ate only one kind of food. And maybe one year that food couldn't __ 1 __. If that happened, man would soon __ 2 __. Luckily, man doesn't __ 3 __ that problem. ...
【简答题】如图所示线性二端网络,已知U S =5V,I S =2A时,U 0 =10V;U S =8V,I S =3A时,U 0 =6V现U S =2V,I S =1A,则电压U 0 =____V。
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