【简答题】Technician A says that pistons are usually made of an aluminum alloy. Technician B says that pistons are usually made of stainless steel. Who is correct?A. Technician A. B. Technician B. C. Both Techn...
【单选题】真空中光速为3×108 m/s,波长为380 nm的紫光,其频率为()。
【单选题】The technician took one day to complete the task which I planned to fulfill within a week.
A.
这位技术员花一天时间完成任务,而我却要用一周来完成。
B.
这位技术员花一周时间完成任务,而我只要一天的时间。
C.
这位技术员花一天时间完成了我原计划用一周完成的任务。
【简答题】Technician A says that airflow can be measured directly. Technician B says that airflow can be calculated. Who is correct?A. Technician A. B. Technician B. C. Both Technician A and Technician B. D. Ne...
【单选题】两个共点力大小分别是30N和50N,则其合力可能是()