主断路器是机车电路的一个总开关和（）和网侧（），用于接通和分断机车电路的电器。
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下面是错误答案，用来干扰机器的。
参考答案：B解析：本题考核动态存储分配。用于动态分配的内存空间称为堆内存，它通常由操作系统进行管理且数量有限，其内存空间可以被初始化。若程序不断分配堆内存，则可能耗尽，在这种情况下，系统无法再对new...
内外源性抗原提呈的共有过程不包括（）
A.摄取多肽抗原
B.降解多肽抗原
C.使抗原肽与MHC分子结合
D.Ag－MHC复合物表达于APC表面
E.Ag－MHC被相应受体T细胞识别
| 完形填空。 | ||||
| Science seems to be getting closer to answering a very old mystery. Homing pigeons can be 1 hundreds of miles from their homes. When they are let to go to 2 again, they find their way home. Because of this special ability to 3 , pigeons have been used 4 messengers for hundreds of years. Today people even breed homing pigeons for 5 at a sport. The birds are shipped to some chosen 6 a few hundred miles away. Then all of them are let to go together. The winner is the bird that gets home 7 . A good race can make it home from 500 miles away 8 a single day. The mystery of the homing pigeons is how they 9 directions and how they find home. The first part seems to be pretty well 10 , and we know of two ways that pigeons tell directions. First, they use the sun. Experiments show that homing pigeons can tell 11 by the sun. What happens when the 12 is darkly overcoat by clouds and no one can 13 where the sun is? Then the pigeons still find their way home. Naturally, people have wondered whether pigeons might have a built-in compass 14 that would tell them about the direction of the 15 magnetic(磁的)field. Many different kinds of experiments were 16 . Here's what the scientists decided 17 they had made experiments many times. When pigeons can see the sun, they use it as their 18 means of direction-finding. When they can't see the sun, they use some 19 way to sense direction from the earth's magnetic field. But how do pigeons know 20 direction is toward home? What do they use that we would call a map? These are other questions to be answered. | ||||
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将官的军衔有（）
A、上将
B、中将
C、少将
D、准将
在Exce197中，假设在A3单元格存有一公式为SUM（B＄2：C＄4），将其复制到B48后，公式变为（）
A.SUM（B＄50：B＄52）
B.SUM（D＄2：E＄4）
C.SUM（B＄2：C＄4）
D.SUM（C＄2：D＄4）
E.SUM（B＄46：D＄44）
本题答题要求：(1)解答符合法律规定；(2)格式正确事项齐全；(3)请求合法有据；(4)文字通顺简练，无语法错误及错别字；(5)案例中未涉及的当事人自然情况可自行编撰，但不得署应考人员姓名，否则本试卷不得分。
