无产阶级政党的组织原则是（ ）
A．集体领导制
B．首长负责制
C．集体问责制
D．民主集中制
参考答案：D
—Can I help you，dear?
—Yeah,l don’t know a banana milk shake. Maybe you can teach me.
A．what to do
B．when to make
C．how to make
D．why to do
下列哪种是高分辨率的专业扫描仪
A．胶片扫描仪
B．手持式扫描仪
C．滚筒式扫描仪
D．平板式扫描仪
