120×5的积末尾只有一个0.______.(判断对错)

题型:解答题

问题:

120×5的积末尾只有一个0.______.(判断对错)

考点:认识乘法
题型:解答题

按测验材料来分,心理测验可以分为三种。 ( )

题型:解答题

质量为2kg的物体沿倾角为300的斜面由静止开始下滑,1秒内下滑了2m,则其重力势能改变了________J,1秒末重力的瞬时功率为________w。 (g=10m/s2

题型:解答题

阅读理解。

     根据短文内容,从短文后的选项中选出能填入空白处的最佳选项,选项中有两项为多余项。

     Do you know how to be street smart? Being street smart means knowing how to keep yourself safe

from strangers when you're alone or with other kids.    1  

     Most strangers aren't dangerous and wouldn't do anything to hurt kids. Unfortunately, though, some

strangers can be dangerous, and it's impossible to tell who's OK and who's not. __2_  That's why it's

important to follow these safety rules all the time:

     Make your whereabouts known.

     The adults who's taking care of you needs to know where you are and when you'll be coming home.

        3  

     It's more fun and safer to do things with friends. Traveling with a friend whenever you can is a good

idea, and traveling with a group of kids is even better.

        4  

     Safe spots are places where you can stop if you need help. Like the houses of kids you know, the

houses of your parents' friends, police stations, libraries, and fire departments. When you're walking or

riding your bike, make a mental note of the safe spots along your route. That way, you'll know where

they are in case you ever need one.

        5  

     You're probably been told lots of times that you should not yell and keep quiet. But when you think

you might be in danger, it's the perfect time to be noisy! If a stranger approaches you, follows you or tries

to grab you, yell as loudly as you can and try to get away. People in the area will hear what's going on and help you, so make plenty of noise.

A. Stick with a friend.

B. Pick out safe spots.

C. It helps you stay safe.

D. Shout "help" when necessary.

E. Go to school with your friends.

F. Make a lot of noise if you are scared.

G. A dangerous person doesn't necessarily look scary.

题型:解答题

固体分散体

A.盐析固化法
B.逆相蒸发法
C.单凝聚法
D.熔融法
E.饱和水溶液法

题型:解答题

能同时被1,2,3,4,5,6,7,8,9,10整除的最小正整数为( )

A.2520

B.1260

C.5040

D.630

更多题库