Thousands of Irish people starved during the "Potato Famine" because
A.they were so dependent on potatoes that they refused to eat anything else.
B.they were forced to leave their homeland and move to America.
C.the weather conditions in Ireland were not suitable for growing potatoes.
D.the potato harvest was bad.
第4题
流量控制阀是靠改变()来控制、调节油液通过阀口的流量,而使执行机构产生相应的运动速度。
A、液体压力大小
B、液体流速大小
C、通道开口的大小
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