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【单选题】
fcc晶体中(111)面上有柏氏矢量为a[1-10]/2的,(11-1)面上有柏氏矢量为a[011]/2的分解为扩展位错时的领先位错分别为为a[2-1-1]/6和a[-121]/6,则两个领先位错在各自面上运动而相遇时,新的位错反应( )进行,新形成的位错( )运动。A.
可以，可以
B.
不可以; 可以
C.
可以;不可以
D.
不可以，不可以
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【单选题】Some crops are relatively high yielders and could be planted in preference to others to ______ the food supply.
A.
enhance
B.
curb
C.
disrupt
D.
heighten
【单选题】某男,45岁。上腹阵发性疼痛,并腹胀.呕吐.停止肛门排气2天。体检:腹胀,见肠型,腹软,轻度压痛,肠鸣音亢进。病人半年前曾作阑尾切除术。目前该病人发生的肠梗阻类型,不可能是( )
A.
急性肠梗阻
B.
完全性肠梗阻
C.
绞窄性肠梗阻
D.
单纯性肠梗阻
E.
机械性肠梗阻
【单选题】－What are on show in the museum?－Some pictures ____ by middle－school students.A．takingB．having be
A.
31.－What are on show in the museum? －Some pictures ____ by middle-school students. A．taking
B.
having been taken
C.
taken
D.
being taken
【单选题】- What are on show in the museum? - Some pictures______by middle-school students.
A.
taking
B.
having been taken
C.
taken
D.
being taken
【简答题】He planted some flowers on the balcony that____________________over the street.
【简答题】放大电路如下图 所示,已知β =50 , U BE =0.7V , U CC =9V , R C =2K Ω, R B =270K Ω ( 1 )此电路的名称是 , 放大电路存在的问题是 ; ( 2 ) 求静态工作点; ( 3 ) 求输入电阻、输出电阻和 电压放大倍数。
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