【单选题】Water is to fish ______ air is to man.
【单选题】______ air is to man, so is water to fish.
【单选题】Water is to fish _____ air is to man.
【单选题】Water is to fish _______ air is to man.
【单选题】Water is as _______ to fish as air is to man.
【单选题】air is to man. so is water to fish .
【单选题】某种疾病引起猪在怀孕早期30-50天感染,胚胎死亡或被吸收,使母猪不孕和不规则地反复发情。怀孕中期50-60天感染,胎儿死亡之后,形成木乃伊,怀孕后期60-70天以上的胎儿有自免疫能力,能够抵抗病毒感染,则大多数胎儿能存活下来,但可长期带毒。这种疾病最可能是( )。
【多选题】可引起怀孕母猪呼吸困难、发热、精神不振,继而发生繁殖障碍的疫病包括( )
【单选题】通常情况下,混凝土的水胶比越大,其强度( )。