— How can I get well along with others, father?

— Try to smile to others, boy. That will make _____ much _____. [ ]

A. them, easier

B. them, more easy

C. it, easy

D. it, easier

在传感器测量电路中，直流电桥与交流电桥有什么不同，如何考虑应用场合？用电阻应变片组成的半桥、全桥电路与单桥相比有哪些改善？