A、 The red lights flash in half-second intervals.
B、 The red lights twinkle in demi-second.
C、 The red lights flag after each half a second.
答案：A
A、 The red lights flash in half-second intervals.
B、 The red lights twinkle in demi-second.
C、 The red lights flag after each half a second.
答案：A
A. 结构类别分为三类：主要的、次要的、备用的。
B. 结构类别分为三类：主要的、次要的、必需的。
C. 结构类别分为三类：主要的、次要的、第三位的。
A. Write instructions in the infinite form.
B. Write instructions in the command form.
C. Write instructions in the appropriate form.
A. When you change a word, always assure that the alternative you choose does not change the sequence of the sentence.
B. When you replace a word, always make sure that the alternative you select does not change the meaning of the sentence.
C. When you exchange a word, always ensure that the alternative you pick does not change the order of the sentence.
A. 警告和注释可用来突出或强调重要的内容。
B. 警告、谨慎和注意可用来突出或强调重点要点。
C. 警告、告诫和注意可用来突出或强调重点要点。
A. The base of the rectangle is 5 cm.
B. The height of the triangle is 5 cm.
C. The base of the triangle is 5 cm.
A. 如果无线电信号不清晰，调整频率。
B. 如果电子信号不清楚，调整波长。
C. 如果广播信号不清楚，测试频率。
A. 将孔铰成比标准尺寸大0.20英寸。
B. 将孔铰成比标准尺寸大0.20英尺。
C. 将孔定位成比标准尺寸大0.20英寸。
A. Paint the fasteners with oil.
B. Apply the fasteners greasy.
C. Apply grease to the fasteners.
A. Accumulate the thickness of the shim as follows: t=x-y.
B. Calculate the thickness of the shim as follows: t=x-y.
C. Calculate the width of the shim as follows: t=x-y.
A. Do not install 0.1 mm thick shims.
B. Do not install shims which are more than 0.1 deep.
C. Do not install shims that are more than 0.1 mm thick.
