The （） of the semi-built method of the con
题型：单项选择题
问题：
The （） of the semi-built method of the construction crankshaft is that by making the two webs and crankpin from a single forging the grain flow in the steel follows the web round into the crankpin and back down the other web.
A.advantages
B.disadvantages
C.power advantages
D.power disadvantages