上下楼梯,一般应靠而行;为人引路时,应走在()位置,并伸出右手作引导状。
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酱腌菜的色泽变化主要有三个途径:()的变化;褐变反应;对辅料色素的吸附。
德昂族语言很有特点,从音位上看,有()个辅音位;元音()个,都有长短之分,共有()个元音音位。
A shepherd’s crook is used to().
A. lower spring buoys into the water
B. find an anchor after the buoy has been lost
C. transfer a pennant wire to the anchor handling boat
D. clean chain as it is hauled into the rig