A、 需每隔一年就清理一下过滤器。
B、 有必要持续清理过滤器。
C、 有必要定期清理过滤器。
答案：C
A、 需每隔一年就清理一下过滤器。
B、 有必要持续清理过滤器。
C、 有必要定期清理过滤器。
答案：C
A. 本文件中的任何零件没有出版商的许可不得复制
B. 本文件中有任何一个部分是没有得到出版商许可的
C. 未经过出版商书面许可,本文件任何部分不得以任何形式复制
A. Restore sections that relate to certain types of trouble.
B. Locate sections that relate in general types of trouble.
C. Recognize sections that lead to particular types of trouble.
A. 任何作为必要的安装或者拆卸程序的调试/测试应该按合适的顺序在文本中显示。
B. 任何作为必要的安装或者重新启动激活程序的调试/测试应该按合适的顺序在文本中显示。
C. 任何作为必要的安装或者重新启动激活程序的校验/测试应该按合适的顺序在文本中显示。
A. 用于保存和输送新鲜饮用水的系统部分。如果饮用水也用于冲洗,则安装有冲水系统。
B. 用于存储和输送水箱内饮用水的系统部分。如果饮用水也用于冲洗,则包括冲水系统。
C. 用于存储和输送新鲜饮用水的系统部分。如果饮用水也用于洗涤,则包括洗涤水系统。
A. I remember the whole thing for it happened yesterday.
B. The whole things seemed to happen yesterday so that I remember it clearly.
C. I remember the whole thing similar it happened yesterday.
A. 用真空清洁器和刷子清洁设备的内部及其底座。
B. 用真空清洁器和刷子清洁设备的外表面以及安装架。
C. 真空清洁设备及硬件设施的表面涂层。
A. The safety procedures are supplied by the manufacturer.
B. Safety procedures are to be supplied to the manufacturer.
C. Safety procedures are provided for manufacturers to follow.
A. At the discretion of the manufacturer, the manual may either be prepared in loose-leaf form with a durable cover or a permanently bound form
B. It is up to the manufacturer to decide whether the manuals presented as a durable loose-leaf or as an eternal binding.
C. The manufacturer is required to decide the format of the manual b e prepared in loose-leaf form and a permanently binding form.
A. 为防止损坏发动机,立即打开所有安装的防护罩。
B. 为防止损坏发动机,稍候装上所有开口的防护罩。
C. 为防止损坏发动机,立即在所有开口上安装防护罩。
A. the blade angle of propeller is the angle between blade face and rotation plane.
B. the blade angle of propeller is the angle between blade face and relative wind.
C. the blade angle of propeller is always acute angle no matter when the working status of the propeller.
