He felt a stone____his back.
A. hitting
B. hit
C. hitted
D. to hit
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In Australia,he made a lot of friends____a very practical knowledge of the English language.
A. get
B. go get
C. getting
D. got
1:100的图样上,钢筋混凝土的构件断面用表示
A. 钢筋混凝土图例
B. 涂黑
C. 涂红
D. 通用剖面线
多层构造说明中,当层次为横向排列,文字说明由上至下与的层次相对应
A. 由上至下
B. 由下至上
C. 由左至右
D. 由右至左
索引符号圆圈的正确画法是
A. 细实线,直径6-8mm
B. 细实线,直径10mm
C. 粗实线,直径14mm
D. 粗实线,直径10mm