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【简答题】
设集合W是满足下列两个条件的无穷数列 的集合：①对任意 ， 恒成立；②对任意 ，存在与n无关的常数M，使 恒成立． （1）若 是等差数列， 是其前n项和，且 试探究数列 与集合W之间的关系； （2）设数列 的通项公式为 ，且 ，求M的取值范围．
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举一反三
【简答题】根据句意和首字母或汉意完成单词。 1. —What would you do if you had a million dollars? —I'd give it to c_________. 2. Pandas are Mary's f_________ animals. 3. He finds watching movies f_________ because the people spea...
【单选题】活塞本体的磨损主要发生在_____部位。1活塞顶;2裙部;3环槽;4销座孔;5环槽根部过渡圆角处;6活塞加强筋。
A.
①+③+④
B.
②+③+④
C.
②+⑤+⑥
D.
①+②+③
【单选题】活塞本体的磨损主要发生在______。 I、活塞顶 II、裙部 III、环槽 IV、销座孔 V、环槽根部过渡圆角 VI、活塞加强筋
A.
Ⅰ+Ⅲ+Ⅳ
B.
Ⅱ+Ⅲ+Ⅳ
C.
Ⅱ+Ⅴ+Ⅵ
D.
Ⅰ+Ⅱ+Ⅲ
【单选题】Della's Donuts had cash inflows from operating activities of $27,000; cash outflows from investing activities of $22,000, and cash outflows from financing activities of $12,000. Calculate the net incr...
A.
$61,000 increase.
B.
$37,000 increase.
C.
$7,000 decrease.
D.
$7,000 increase.
E.
$34,000 decrease.
【单选题】The example of tadpoles, fish eggs and waterfowl is used to show that the activities of man could give rise to negative chain reactions.
A.
Y
B.
N
C.
NG
【单选题】The example of tadpoles, fish eggs and waterfowl is used to show that the activities of man could give rise to ______.
A.
protecting the enviornment
B.
helping to balance nature
C.
negative chain reactions
D.
killing all the living things
【单选题】--- Would you have called her up _____ possible?
A.
- Yes, but I _____ busy doing my homework.
B.
had it been … was
C.
if it was … were
D.
if it had been … had been
E.
if it were … would be
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