root and stem
单选题How should the lifeboat sea painter be rigged?（）A Secured to the inboard side of a forward thwart and led inboard of the fallsB Spliced into the ring on the stem postC Secured by a toggle to the stem post and led outboard of the fallsD Secured by a toggle around the outboard side of a forward thwart
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名词解释题神经干细胞(neural stem cell)
单选题A frame with two，or sometimes four，arms through which are threaded the guidelines and which is used to keep the drill stem and bit in line with the center opening in the temporary guide base is the（）.A drill stem guideB guide frameC drill string frameD casing guide
单选题有时风大流急，船舶靠码头时必须掉头顶流。（）A A ship has to turn to stem the tide because the wind is strong when she is getting alongside a wharf.B Sometimes the wind is strong and the current is rough, so a ship has to turn to stem the tide when she is getting alongside a wharf.C The wind is big, a ship must get alongside a wharf so she has to turn to stem the tide.D A ship has to turn to stem the tide so she can get alongside a wharf.
名词解释题somatic stem cell (成体干细胞)
名词解释题root and stem
单选题Which of the following commands can be used to gain root privileges and profile without initially logging in as root?（）Asu Bsu root Csu - root Dsu -c root
