A．n elevator pitch or named elevator speech or statement refers to such a talk as a speaker, like a salesman, tries to present a valuable idea to the listener in an elevator.()

[单选题]H．ow long did he stay in the elevator?A． Twenty-four hours. B. From Saturday to Monday.C． More than sixty hours. D. From Tuesday to Saturday.

[单选题]What did he do in the elevator most of the time?A． Shouted and screamed. B. Slept and waited.C． Telephoned his boss. D. Ate and drank.

[名词解释] 新燃料升降机 new fuel elevator

[名词解释] pitch

[名词解释] 音高（Pitch）

[单选题]_____ of the controllable pitch propeller enables the blades to be moved to change the pitch angleA．An external mechanismB．An internal mechanismC．An interlock deviceD．A hunting gear system

[名词解释] 音名（Pitch name）

[单选题]The building was named Ford Hall( )memory of a man named James Ford.A.toB.i

[单选题]C．ompared to a constant pitch propeller, a controllable pitch propellerA．more efficiently uses available engine powerB．operates at a lower efficiency at a fixed speedC．produces the same torque at lower engine powerD．develops its rated power at a lowe

[单选题]A． controllable pitch propeller on a diesel driven vessel eliminates the need forA．friction clutchesB．disconnect clutchesC．reversing gearsD．reduction gears