标准麻花钻的螺旋角在18°~30°之间。( )
参考答案:对
Each fire pump on a ship must have a pressure gauge located at().
A.the pump discharge
B.the manifold connection
C.each fire station discharge
D.the pump station
速冻产品销售产品应在冷冻条件下销售,低温陈列柜内产品的温度不得高于-12℃。