See the flags on top of the building?That was___we did this morning.

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when which where What

若四个检查项目均不低于Bu级，可按占多数的等级确定若仅一个检查项目低于Bu级，定为Bu级若不止一个检查项目低于Bu级，定为Cu级若三个检查项目低于Bu级，定为Du级

when which where What

in; from from; in of; in in; of

when which where What

when which where what

FLAGS，IP，CS IP，CS，FLAGS CS，IP，FLAGS FLAGS，CS，IP

when which where what

when　 which　 where　 what

CS、IP、Flags IP、CS、Flags Flags、CS、IP Flags、IP、CS

adopted adapted accompanied annoyed

若四个检查项目均不低于Bu级，则可按占多数的等级确定若仅一个检查项目低于Bu级，则定为Bu级若不止一个检查项目低于Bu级，则定为Cu级若三个检查项目低于Bu级，则定为Du级

when which where what

in; from from; in of; in in; of

when which where what

beng fu beng bu ben fu peng bu

5－BU诱发突变的机制是诱发DNA链发生碱基种类替换 5－BU诱发突变的机制是阻止碱基配对培养过程中可导致A/T对变成G/C对，或G/C对变成A/T对 5－BU诱发突变发生在DNA分子复制过程中