单片机4个并行口既可以按________操作,也可以按________操作。若将P1.0置1,应采用的语句分别是______________和______________。
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Oil is an important _____ material, which can be processed(加工) into many different chemical products, including plastics.
A. primary
B. raw
C. original
D. critical
Mark _____ his way on to the crowded bus but failed to get a seat.
A. elbowed
B. bowed
C. crowded
D. rowed
This _____ can be used to measure sea surface temperatures.
A. vehicle
B. engine
C. implement
D. instrument
He was so seriously ill that even the most _____ doctors could not cure him.
A. eminent
B. important
C. imminent
D. essential