YF100型漩涡流量计在（）使用
A、要校准后才能
B、可直接安装使用
C、校准、累计流量的清零后
D、测量过程中对结果进行修正
参考答案：B
_____ to find a job after graduation from college, he had to depend on his parents for a living. [ ]
A. Being not able
B. Not being able
C. To be not
D. Not to be
转型期阶层分化的一般规律有哪些？
