混流式水轮机的结构，按水流流径的路径主要有几部分组成？
对疑为肾动脉狭窄患者，不能进行诊断的影像学检查方法是（）
A. MRA
B. 排泄性造影
D. 超声
F. 肾动脉造影
G. CTA
Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet（）。
A. Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point link.
B. Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal.
C. Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth.
D. Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive.
以下哪些参数不会在小区激活过程中出现（）
A. 上、下行时隙分配
B. 小区重选门限
C. 频点
D. 功率
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