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【判断题】
采用节流阀的节流调速回路,在负载变化时,液压缸的速度不随节流阀两端压差而变化。A.
正确
B.
错误
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知识点：
皮皮学刷刷变学霸
举一反三
【多选题】缺铁性贫血幼儿饮食禁忌( )
A.
少食芹菜、蒜苗、韭菜等含草酸高的蔬菜，有利于铁质的吸收。
B.
忌添食牛奶补血，因牛奶本身也“贫血”，含磷成分又较多，直接影响铁的吸收。
C.
忌单一添加植物类食物补血，因动物中铁质更有利于人体吸收。
D.
1岁以下婴儿不适合添加鸡鸭血、猪血类补血，不容易消化。
【单选题】Which of the following is true according to the passage?
A.
New Yorkers are usually open with strangers.
B.
People from the South are usually considered good hosts．
C.
The friendliest Americans travel from place to place.
D.
Different parts have different customs and habits.
【单选题】From this passage we can know that ______.
A.
it' s difficult to open a checking account in America
B.
you must always keep at least $ 50 in your account
C.
you must deposit $ 50 at least for opening an account
D.
while studying in America, you must have a checking account
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