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【单选题】
已知某三相四线制电路的线电压 V, 的向量=380∠ - V ,的向量=380∠ V ,当 t=12s 时,三个相电压之和为() 。A.
380V
B.
0V
C.
380 V
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举一反三
【单选题】关于再生障碍性贫血的临床表现,错误的是
A.
主要表现为贫血、出血及感染
B.
常有肝脾大，罕有淋巴结肿大
C.
分为重型再障和非重型再障
D.
重型再障起病急、进展快、病情重
E.
少数NSAA可进展为SAA
【多选题】关于再生障碍性贫血的临床表现,正确的是
A.
主要表现为贫血、出血及感染
B.
常有肝脾大，罕有淋巴结肿大
C.
分为重型再障和非重型再障
D.
重型再障起病急、进展快、病情重
E.
少数NSAA可进展为SAA
【单选题】未生育妇女的子宫大小及宫腔容量应是:
A.
7×5×3cm,容是 12ml
B.
8×5×3cm,容量 10ml
C.
6×4×3cm,容是 3ml
D.
7×5×3cm,容是 5ml
E.
9×6×4cm,容是 7ml
【单选题】Scientists generally agree that the Earth's climate will warm up over the next 50 to 100 years ______ it has warmed in the 20000 years since the Ice Age.
A.
as soon as
B.
as long as
C.
as much as
D.
as well as
【单选题】关于再生障碍性贫血的临床表现,错误的是
A.
主要表现为贫血、出血及感染
B.
常有肝脾大,罕有淋巴结大
C.
分为重型再障和非重型再障
D.
重型再障起病急、进展快、病情重
E.
少数NSAA可进展为SAA
【简答题】Standardized exam in American public education are being reformed. Over the next four years, hundreds of university professors and testing experts will work together to design new assessment system. T...
【单选题】未生育妇女的子宫大小及宫腔容量应是
A.
7cm×5cm×3cm容量12ml
B.
8cm×5cm×3cm容量10ml
C.
6cm×4cm×3cm容量3ml
D.
7cm×5cm×3cm容量5ml
E.
9cm×6cm×4cm容量7ml
【单选题】Scientists generally agree that the Earth's climate will warm up over the next 50 to 100 years ______it has warmed in the 20,000 years since the Ice Age.
A.
as long as
B.
as much as
C.
as soon as
D.
as well as
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