在125×8=1000中,如果把因数8除以2,积是______.
在125×8=1000中,如果把因数8除以2,积也除以2,
积是:1000÷2=500;
故答案为:500.
读短文,判断正误,与短文内容相符的在括号内打“√”,不相符的打“×”。
Little Water Drop and his friends become very heavy. They fall down into a lake. The sun comes out. They
feel warm again. Then, they meet Mr. Wind. Mr. Wind helps them go up to the sky again.
( ) 1. Little Water Drop and his friends become light (轻的).
( ) 2. It falls down into a lake.
( ) 3. The sun comes out. Little Water Drop feels cold.
( ) 4. Little Water Drop meets Mr. Rain.
( ) 5. Mr. Wind helps little Water Drop go up to the sky.
下面是关于PC机串口(COM1、COM2)、USB接口和IEEE-1394接口的叙述,正确的是()。
A.它们均以串行方式传送数据
B.串口和USB接口以串行方式传送数据,IEEE-1394接口并行方式传送数据
C.串口和IEEE-1394接口以串行方式传送数据,USB接口以并行方式传送数据
D.串口以串行方式传送数据,USB接口和IEEE-1394接口以并行方式传送数据