在初生根的横切面上，初生木质部和初生韧皮部各三束，故为“六原型”。
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客舱紧急逃离绳安装在（）
A. 前乘务员座椅下的储箱中
B. 左后乘务员座椅下的储箱中
C. 右后乘务员座椅下的储箱中
D. 安装紧急出口窗的框顶上
井下经纬仪导线点分永久点和临时点两种。
A. 正确
B. 错误
At night，if you see a vessel ahead displaying the lights shown you should（）.
A. provide assistance as the vessel is in distress
B. stay clear as the vessel is transferring dangerous cargo
C. stay clear as the vessel is fishing
D. change course to the right as the vessel is crossing your bow
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