影响酶活性测定的因素有()

A．底物浓度、反应体系的温度

B．样品存放的温度和时间

C．缓冲液的pH、种类和离子强度

D．辅酶、激活剂、抑制剂

E．以上都是

All gear, such as pilot ladder, accommodation ladder, hoist, etc., necessary for a safe transfer of the pilot is known as（）.

A.riggins

B.gears

C.boarding arrangements

D.fittings