检测体外抗原、抗体最敏感最简便的试验方法是()。 ["A、直接凝集反应","B、对流免疫电泳","C、酶联免疫吸附试验","D、补体结合反应","E、免疫比浊"]
确定浇注位置时,将铸件的大平面朝下放置,主要目的是为了() ["避免浇不足;","避免裂纹;","避免缩松;","防止夹渣"]
我行1个客户只能有短信缴费账户,1个手机对应()个账户计费? ["1个,1个","2个,2个","3个,3个","多个,多个"]
福建闽越人图腾() ["蛇","鸟","猴","狗"]
测电导率时,通过温度补偿可以() ["A.校正电导池常数","B.直接测得水样在25ºC时的电导率","C.直接测得水样在当前温度下的电导率","D.直接测得水样在20ºC时的电导率"]
防止或减轻低温腐蚀的基本方法有哪些?