Sino-foreign educational program on business is popular in China now, and the demand for high level interpretation is great.

A．programs in enterprises/high level interpreters

B．programs in international business/senior interpreters

C．program in international biz/senior interpretations

D．programs of business/high-level interpretations

坍落度试验适用于骨料最大粒径不大于40mm，坍落度值不小于（）的混凝土拌合物。

A、5mm

B、10mm

C、15mm

D、20mm