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当地下燃气管道穿过排水管、热力管沟、联合地沟时，燃气管道外部必须（）。
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控制处理器通过（）以通讯的方式与I/O端子组件柜、通讯端子板及通讯端子柜等连接，进行信息的传递
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当ARPA选择“相对运动---真矢量”时，本船的速度矢量在屏幕上是（）。
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猪夹心肉具有肌阔、（）、肉质紧、吸水量大的特点。
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一路纵队看齐时，可以下达（）的口令。
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Questions 26 to 30 are based on the following passage. Exercise is one of the few factors with a positive role in long-term maintenance of body weight. Unfortunately, that message has not gotten through to the average American, who would rather try switching to “light” beer and low-calorie bread than increase physical exertion. The Centers for Disease Control, for example, found that fewer than one-fourth of overweight adults who were trying to shed pounds said they were combining exercise with their diet. In rejecting exercise, some people may be discouraged too much by caloric-expenditure charts: for example, one would have to briskly walk three miles just to work off the 275 calories in one delicious Danish pastry (小甜饼). Even exercise professionals concede half a point here. “Exercise by itself is a very tough way to lose weight,” says York Onnen, program director of the President’s Council on Physical Fitness and Sports. Still, exercise’s supporting role in weight reduction is vital. A study at the Boston University Medical Center of overweight police officers and other public employees confirmed that those who dieted without exercise regained almost all their old weight, while those who worked exercise into their daily routine maintained their new weight. If you have been sedentary (极少活动的) and decide to start walking one mile a day, the added exercise could burn an extra 100 calories daily. In a year’s time, assuming no increase in food intake, you could lose ten pounds. By increasing the distance of your walks gradually and making other dietary adjustments, you may lose even more weight. “Even exercise professionals concede half a point here” (Line 3, Para. 2) means “They （）”.
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霍乱弧菌最重要的致病物质是（）
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物体A、B的位移-时间（s-t）图像如图1所示，由图可知（）
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检查圬工裂纹宽度的仪器是（）。
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白朴所写的著名历史剧是（）。