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【判断题】
尺寸界线用来限定所标注尺寸的范围,应用细实线绘制,一般应与被注长度垂直。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【单选题】由于凸轮与从动杆的运动不在同一平面内,因此是一种空间凸轮机构,可使从动杆得到较大的行程这种凸轮机构属于( )。
A.
盘形凸轮机构
B.
移动凸轮机构
C.
圆柱凸轮机构
D.
圆锥凸轮机构
【单选题】Over the past l00 years，sea level steadily as a result of global warming．
A.
had increased
B.
has been increasing
C.
increased
D.
is increasing
【简答题】The UK's education system is ranked（排列） sixth best in the developed world, according to a global league table published by education firm Pearson in October,2012. The first and second places are taken...
【简答题】无阻尼单自由度体系的自由振动方程，其通解为$y(t) = {C_1}sin omega t + {C_2}cos omega t$，则质点的振幅为（ ）。
【单选题】As environmental protection becomes a global issue, a new term —'Green EFL' is working its way into our vocabulary. What does it mean? The Project in the English Country School in southern England giv...
A.
going on a diet
B.
recycling
C.
farm animals
D.
jazz music
【简答题】As more and more people speak the global languages of English, Chinese, Spanish, and Arabic, other languages are rapidly disappearing. In fact, half of the 6,000-7,000 languages spoken around the worl...
相关题目：
【单选题】由于凸轮与从动杆的运动不在同一平面内,因此是一种空间凸轮机构,可使从动杆得到较大的行程这种凸轮机构属于( )。
A.
盘形凸轮机构
B.
移动凸轮机构
C.
圆柱凸轮机构
D.
圆锥凸轮机构