A.缺水 B.缺血 C.缺氧 D.缺營(yíng)養(yǎng)
A.不溶于水 B.微溶于水 C.易溶于水和油 D.不溶于水,溶于油
A.20ppm B.600~700ppm C.300~400ppm D.100~200ppm