微喷灌主要适用于()
A.高秆作物
B.水稻
C.大田作物
D.经济作物
参考答案:C
The terrestrial system of GMDSS consists of().
A.radio-telephony, DSC, Direct Printing Telegraphy,Navtex and SART
B.INMARSAT, DSC, Direct Printing Telegraphy, Navtex and SART
C.radio-telephony,DSC,EPLRB,Navtex and SART
D.Status Recording system,DSC,Direct Printing Telegraphy, Navtex and SART
温室里栽培的茄果类蔬菜,因花粉发育不良,影响传粉受精,如果要保证产量,可采取的补救措施是()
A.喷洒N肥
B.提高CO2浓度
C.喷洒P肥
D.喷洒生长素类似物