轨旁ATP系统采用的是()系统。
A、二取一
B、二取二
C、三取一
D、三取二
参考答案:D
The company has a free long-distance telephone number _____ customers may call with any question
they have about its products.
[ ]
A. so that
B. although
C. even if
D. as though
试述少阳病的提纲证及其产生机制。