骑车四冲程内燃机的一个工作循环一般分为吸气、压缩、做功、排气_爱下问搜题

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问题填空题

骑车四冲程内燃机的一个工作循环一般分为吸气、压缩、做功、排气四个冲程，在这四个冲程中，把机械能转化为内能的是冲程。某单缸四冲程内燃机飞轮转速为1200r/min，该内燃机每秒钟对外做功的次数为次

答案

压缩 10

题目分析：四冲程热机，将机械能转化为内能的是压缩冲程。飞轮每转2转，内燃机对外做功1次。飞轮的转速是1200r/min，每秒转20次，每秒对外做功10次。

选择题

选字组词。

环浇应该四香

绕刻季

彩红指导愉快

虹异树

完形填空

My husband, Tom, has always been good with animals, but I was still amazed when he befriended a female grouse (松鸡). It's         for a grouse to have any contact (接触) with people. In fact, they're hard to spot,       they usually fly off when they hear humans approaching.
This grouse came into our lives in     Tom was working out in the field when he      her walking around at the edge of the field. She was       unafraid and seemed to be      about what he was doing.
Tom saw the       bird several times, and she got more comfortable around him. We quickly grew       of the bird and decided to call her Mildred.
One day, as Tom was working, Mildred came within a few feet of him to watch. Tom      he didn't see her and kept working to see what she would do next.
Apparently, she didn't like to be       . She'd run up and peck (啄) at Tom's hands, then       off to see what he would do. This went on for about 20 minutes, until Mildred became tired of the        and left.
As spring went and summer came, Mildred started to        more and more often.       Mildred felt comfortable enough to jump up on Tom's leg and stay long enough for me to get a        of the two of them together. This friendly grouse soon felt        not just with our family, but with anybody who walked or drove by.
When hunting season opened, we put a        at the end of our driveway asking       not to shoot our pet grouse. My father, who lived down the road,        warned people not to shoot her.       . hunters would stop and take pictures, because they had never seen anything like her.

A．interesting

D．surprisingly

A．comfortable

D．loudspeaker

C．On the contrary