皮皮学,免费搜题
登录
搜题
【单选题】
在介质中,由于微粒的热运动而产生的质量迁移现象,主要是由于密度差引起的,这种现象称为( )
A.
数量极移动
B.
扩散现象
C.
细胞悬浮
D.
分离沉降
E.
重力场作用
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
.
..
皮皮学刷刷变学霸
举一反三
【多选题】关于三相异步电动机的工作原理,说法正确的有
A.
必须有转速差;转速差越大,转子电流就越大,电磁转矩也越大。
B.
转子电流的产生、电能从定子到转子的传递都是基于电磁感应现象,因此异步电动机也称为感应电动机。
C.
转子和旋转磁场不同步,故此电动机称为异步电动机。
D.
电机启动时,转差率s很小(≈0.015~0.060)。
【判断题】I. Tell whether the flowing statements are true or false I.one of the objective of quantity purchase discounts and forward buys. 2.B a s i cally warehousing has thee functions: movement ,storage, and ...
A.
正确
B.
错误
【单选题】命令( )可以实现从IP地址到以太网MAC地址转换。
A.
ping
B.
ifconfig
C.
arp
D.
traceroute
【单选题】— do they play basketball? --- Every afternoon.
A.
When
B.
Where
C.
What
D.
How
【单选题】关于数据,下列说法正确的是:
A.
数据就是数学中的数,包括整数、实数等。
B.
在计算机中数据可以采用二进制、八进制、十六进制存储。
C.
数据可分为数值型、文本型等不同的数据类型,数值型数据采用补码表示,文本型采用字符编码。
D.
同样的数据在内存储器和外存储器中的占用的存储空间大小一定不同。
【单选题】实现从IP地址到以太网地址转换的命令为:( )
A.
ping
B.
ifconfig
C.
arp
D.
traceroute
【单选题】修剪物体需用的命令是
A.
Trim
B.
Extend
C.
Stretch
D.
Chamfer
【简答题】Questions 3 and 4 are based on the news report you have just heard. 3. A) He works at a national park. B) He is a queen been specialist. C) He removed the Beyond from the boot. D) He drove the bees aw...
【单选题】A) He is a queen been specialist . B) He works at a national park . C) He removed the beyond from the boot . D) He drove the bees away from his car. 4 .
A.
) They were a lot of noise
B.
) They were looking after the queen
C.
) They were dancing in a unique way
D.
) They were looking for a new box to live in
【单选题】They practice ____________ basketball every afternoon.
A.
playing
B.
play
C.
to play
D.
played
相关题目: