∵x2=1,
∴x=±1,
∴3x=±1.
— How does your sister go to work in the morning?
— _____. Because the office is near our home. [ ]
A. By bus
B. By car
C. On foot
D. It's OK
下列对海州常山的冬态描述不正确的是()。
A、叶痕互生,叶迹3个以上
B、嫩枝和叶柄有黄褐色短柔毛
C、枝髓有淡黄色薄片隔膜
D、侧芽叠生,裸芽