單項(xiàng)選擇題氣調(diào)養(yǎng)護(hù),一般來(lái)說(shuō),能殺死幼蟲(chóng)、蛹和成蟲(chóng)的二氧化碳濃度為()

A.20%
B.35%以上
C.15%
D.10%
E.8%


你可能感興趣的試題

3.單項(xiàng)選擇題相對(duì)來(lái)說(shuō),晝夜相對(duì)濕度變化規(guī)律,單波型最低時(shí)為()

A.日出前
B.6~8時(shí)
C.10~12時(shí)
D.12~14時(shí)
E.14~16時(shí)

4.單項(xiàng)選擇題相對(duì)來(lái)說(shuō),晝夜溫度變化規(guī)律,最高時(shí)一般為()

A.10~12時(shí)
B.12~14時(shí)
C.14~16時(shí)
D.16~18時(shí)
E.日出前

5.單項(xiàng)選擇題可導(dǎo)致中藥害蟲(chóng)生理失調(diào)或死亡的低濕度范圍在()

A.10%~20%
B.20%~30%
C.30%~40%
D.40%~50%
E.50%~60%