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【单选题】
在不改变传动比和中心距的前提下,采取 措施以增大V型带传动所传递的功率较为合理。A.
增设张紧轮，以调整初拉力和正压力
B.
将轮槽两工作斜面加工得很粗糙，以增大摩擦系数
C.
将轮槽角加工成40度，与V型带横截面夹角相吻合
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皮皮学刷刷变学霸
举一反三
【单选题】People _______ our support and help . We must do something at once.
A.
in need
B.
in need of
C.
in need need
D.
in need of need
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate the scientist
B.
Science affects almost every aspect of our life
C.
Scientists live in a specific subculture
D.
It is easier to understand general characteristics of science
【简答题】滤波的作用是将 直流电变为 直流电。
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate scientists
B.
Science affects almost every aspect of our life
C.
Scientists live in a specific subculture
D.
It is easier to understand general characteristics of science
【单选题】We need to know something about the structure and operation of science because_________.
A.
it is not easy to understand the things that excite and frustrate scientists
B.
science affects almost every aspect of our life
C.
scientists live in a specific subculture
D.
it is easier to understand general characteristics of science
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate science
B.
science affects almost every aspect of our life
C.
scientists live in a specific substructure
D.
it is easier to understand general characteristics of science
【单选题】We need to know something about the structure and operation of science because ______.
A.
it is not easy to understand the things that excite and frustrate the scientist
B.
science affects almost every aspect of our life
C.
scientists live in a specific subculture
D.
it is easier to understand general characteristics of science
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