猜一猜,□下面是几?
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(1)12 -9=□ |
(2)12 -□=7 |
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(3)7 +□=12 |
(4) □+8=12 |
把下面单位符号的中文名称填在括号里:
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(1) |
(2) |
(3) |
(4)m |
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( ) |
( ) |
( ) |
( ) |
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(5)mm |
(6)k g |
(7) g |
|
|
( ) |
( ) |
( ) |
填上合适的质量单位.
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|
|
|
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(1)5( ) |
(2)120( ) |
(3)27( ) |