But all of that are usually discommodious and insecure to some extent, for example toting, forgetting, losing and peculating and so on.
但各种措施都或多或少地伴随着要携带、易遗忘、易丢失、被盗用等不
便和不安全
。
便
,麻烦But all of that are usually discommodious and insecure to some extent, for example toting, forgetting, losing and peculating and so on.
但各种措施都或多或少地伴随着要携带、易遗忘、易丢失、被盗用等不便和不安全。
Weighing filtration membrane is often used to get the dust concentration of environment.However,this method is discommodious and can not get the instantaneous transformation of dust concentration.
环境粉尘浓度
一般使用滤膜称重法得,该法费时费力,且不能得到瞬时粉尘浓度变化。
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