下列说法错误的是()。
A.构件是由一个或多个零件通过静联接而成
B.机构由一个或多个构件通过动联接而成,各构件之间具有确定的相对运动
C.机器与机构的区别在于机器能够实现能量的转换
D.一台机器中至少包含两个或两个以上的机构
第1题
The passage mainly tells us ______.
A.how to follow a healthy diet during a holiday
B.how to control your foods during a holiday
C.how to maintain your normal weight during a holiday
D.how to maintain physical activity during a holiday
第2题
The passage mainly tells us ______.
A.how to follow a healthy diet during a holiday
B.how to control your foods during a holiday
C.how to maintain your normal weight during a holiday
D.how to maintain physical activity during a holiday
第3题
The passage mainly tells us ______.
A.how to follow a healthy diet during a holiday
B.how to control your foods during a holiday
C.how to maintain your normal weight during a holiday
D.how to maintain physical activity during a holiday
第4题
In order to keep healthy, old people should do all the following items except ______.
A.giving up smoking
B.eating a balanced diet
C.eating eggs and beef
D.doing regular exercises
第5题
A、Do not smoke and drink alcohol
B、Do regular exercise and have a balanced diet
C、Do more walking, running and swimming
D、Eat less fat, oil, sweets and more nutritious food
第6题
Mr.Green's good health is chiefly ________ proper diet and regular exercise.
A.due to
B.because
C.in connection with
D.in accordance with
第7题
According to the passage, which of the following could be considered as a healthy diet?
A.A diet that is sugar free but nutrient-rich.
B.A diet that is sodium free but vitamins-rich.
C.A diet that contains a lot of potassium and calcium.
D.A diet that consists of low-fat meat and fresh plants.
第8题
According to the passage, which of the following could be considered as a healthy diet?
A.A diet that is sugar free but nutrient-rich.
B.A diet that is sodium free but vitamins-rich.
C.A diet that contains a lot of potassium and calcium.
D.A diet that consists of low-fat meat and fresh plants.
第9题
According to the passage, which of the following could be considered as a healthy diet?
A.A diet that is sugar free but nutrient-rich.
B.A diet that is sodium free but vitamins-rich.
C.A diet that contains a lot of potassium and calcium.
D.A diet that consists of low-fat meat and fresh plants.
第10题
A healthy diet is______for maintaining good overall health.
A.essential
B.potential
C.regular
D.particular
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