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【简答题】
某台数控机床的进给系统由电机驱动,已知电机的脉冲当量为 0.005mm,快速行程速度为1800mm/min,则选用电机的快速行程的工作频率应为 _________ HZ。
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举一反三
【单选题】Scientists _______ a lot of experiments on animals, hoping to find and effective way to cure the patients who had AIDS.
A.
carried on
B.
carried out
C.
carried away
D.
carried off
【单选题】With no hope for cure and no way to reduce her pain and suffering from the terrible disease, the patient _____her doctor's help to end her life. [ ]
A.
commanded
B.
sought
C.
found
D.
ordered
【单选题】A doctor's obligation when he can no longer______ the approach of death is to make the patient comfortable, including easing his pain.
A.
hang around
B.
hang on
C.
hold back
D.
hold on
【单选题】After a careful examination, the doctor ______a new medical and a two-day rest for the patient.
A.
described
B.
inscribed
C.
prescribed
D.
transcribed
【单选题】ECT remains an effective antidepressant treatment partly because it can
A.
stimulate the patient to be more active.
B.
stimulate the brain to grow new blood vessels.
C.
help a patient recall what has happened.
D.
help a patient to come to his consciousness.
【单选题】A health care project can provide treatment ______ half the cost or less，______ the needs of the patient.
A.
at；relied on
B.
with；relying on
C.
at；relying on
D.
by；relies on
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