| At last her efforts bore fruit. Burton
was appointed to Santos, in Brazil, where Isabel might also go. They made their
farewell rounds and Isabel learnt Portuguese while she packed up. At Lisbon
three-inch cockroaches seethed about the floor of their room. Isabel was caught
off her guard, but Burton was brutal," I suppose you think you look very pretty,
standing on that chair and howling at those innocent creatures." Isabel’s
reaction was typical. She reflected that of course he was right; if she had to
live in a country full of such creatures, and worse, she had better pull herself
together. She got down and started lashing out with a slipper. In two hours she
had got a bag of ninety-seven. On arrival in Brazil she found that Portuguese fauna had been nothing. Now there were spiders, as big as crabs. A. interested in becoming a monk or an emplorer. B. very interested in his work and a number of other things. C. bored by his work and his duties. D. bored by his work and his many other interests and activities. [单选题]JT-1型晶体管图示仪“基极阶梯信号”中的串联电阻的作用是( )。
A.限制基极电流 B.将输入电流变化转变为电压变化 C.将输入电压变化转变为电流变化 D.限制功耗 [多选题]0ML功率放大器中与负载串联的电容器具有( )和( )的功能。
A.传送输出信号 B.对电源滤波 C.提高输出信号电压 D.充当一个电源,保证晶体管能正常工作 [判断题]5号线列车当整列列车越过停车标时，司机需倒台后以NRM模式牵引列车退行对位。
A.正确 B.错误 [名词解释]比较史学
[单项选择]在有坡度的电缆沟内或建筑物上安装的电缆支架应有与电缆沟或建筑物（）的坡度。
A. 不同 B. 相同 C. 水平 D. 水平或垂直 [单选题]峭壁、陡坡的工作场地或人行道上，冰雪、碎石、泥土应经常清理，靠外面一侧应设1050～1200mm高的栏杆，栏杆内侧设（ ）高的侧板。
A.A.180mm B.B.150mm C.C.120mm D.D.210mm [单项选择]Questions 41 to 44 are based on the following passage:
By direct observations and many experiments, biologists have discovered that practically all animals have some sense of hearing or vibration. Earthworms feel vibrations in the soil, fish can be trained to respond to certain tones, male mosquitoes are attracted by the sound of the female, and frogs will respond to a tape recording of their own voices.
The inner ear is composed of delicate membranes which bear dense patches of specialized cells called maculae. Each of these collections of cells can carry a message to the brain. What message is carried by a macula depends upon how it is affected. The message which is carried is not, however, always connected with the hearing sense. For instance, a certain kind of tadpole can tell the depth of the water it is swimming in by the pitch of a tone which is produced by its own lungs.
In the human and all other mammals, the macula has developed into an organ which can easil
A. how sound is produced B. learning by observing C. the workings of the inner ear D. outer ear formation in various animals [判断题]在土质松软处挖坑，应有防止塌方措施，如加挡板、撑木等。可以站在挡板、撑木上传递土石或放置传土工具。禁止由下部掏挖土层。
A.正确 B.错误 [判断题]静态工作点设置的过低，容易造成饱和失真
A.正确 B.错误 [判断题]( )（ ）用来测量三棱镜度的直尺称为正切尺。
A.正确 B.错误 [判断题] 检修发电机、同期调相机，检修机组装有二氧化碳或蒸汽灭火装置的，则在风道内工作前，应采取防止灭火装置误动的必要措施。
A.正确 B.错误 我来回答: 提交
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