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（Msp）→A，（SP）+1→SP （SP）+1→SP，（Msp）→A （SP）－1→SP，（Msp）→A （Msp）→A，（SP）－1→SP
SP1>SP2>SP3 SP1>SP3>SP2 SP2>SP1>SP3 SP3>SP2>SP1 SP3>SP1>SP2
had sent sent would have sent would send
were sent had been sent have been sent are sending
SP1＜40mg/L SP1＜80mg/L SP1＜100mg/L SP1＞100mg/L SP1＞150mg/L
has sent is sent will send was sent
send sent has sent had sent
The, a /, a ' A., the /, the
may not should not must not cannot
the; a a; / a; the the; /
be sent is sent has been sent was sent
sp1>sp2>sp3 sp1>sp3>sp2 sp2>sp1>sp3 sp3>sp2>sp1 sp3>sp1>sp2
invention production operation preparation
A. /; a the; a a; the /; /
is sent has been sent be sent was sent
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