在某电场中,电量为10-9 C的点电荷,在A点受到的电场力是2×10-5 N ,

题型:选择题

问题:

在某电场中,电量为10-9 C的点电荷,在A点受到的电场力是2×10-5 N ,则A点的电场强度大小是[ ]

A.2×104 N/C

B.5×10-5 N/C

C.2×10-14 N/C

D.不能确定A点电场强度的大小

考点:电场强度的定义式
题型:选择题

衰老的中性粒细胞破坏所在的主要系统是()

A.红细胞系统

B.脾脏

C.肝脏

D.单核--吞噬细胞系统

E.淋巴细胞系统

题型:选择题

泛突厥主义的由来及其在新疆的代表人物与活动。

题型:选择题

当一个人有两个或以上的社会位置,而这些角色预期互不兼容时,就产生()

A.角色不清

B.角色紧张

C.角色中断

D.角色冲突

题型:选择题

(A) 条件(1)充分,但条件(2)不充分.
(B) 条件(2)充分,但条件(1)不充分.
(C) 条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
(D) 条件(1)充分,条件(2)也充分.
(E) 条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.

David has three credit cards: a Passport card, an Everywhere Card, and an American Local card. He owes balances on all three cards. Does he owe the greatest balance on the Everywhere Card
(1) The sum of the balances on his Everywhere Card and American Local card is $1, 350, which is three times the balance on his Passport card.
(2) The balance on his Everywhere Card is [*] of the balance on his Passport card and [*] of the balance on his American Local card.

题型:选择题

作为商品流通形式的是()

A.w-w’

B.W-G-W’

C.G-G’

D.G-W-G’

E.W_B_Wr

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