In the cam-less engine,the camshaft functions are replaced by ____ actuators. A: electronically controlled B: hydraulically controlled C: pneumatically controlled D: electronic- hydraulically controlled

The controlled practice is controlled by the teacher or by the grammatical rules._

A ( )is one that is controlled by hand.

可见光光谱的波长位于（ ）范围？ A: 390 nm~ 760 nm B: 390 nm~ 720 nm C: 390 nm~ 780 nm D: 380 nm~ 760 nm

被控量（controlled variable）

A transistor is a current controlled device

UVA 是指以下哪一段波长范围( )。 A: 480 nm ~ 400 nm B: 400 nm ~ 320 nm C: 320 nm ~ 280 nm D: 280 nm ~ 200 nm

G.653的零色散波长和最低损耗窗口分别为？ A: 850 nm，1310 nm B: 1310 nm，1310 nm C: 1310 nm，1550 nm D: 1550 nm，1550 nm

Under the agreement, the nuclear warheads will be ______. A: controlled by Russia B: controlled by the Black Sea Fleet C: disassembled in Ukraine D: disassembled in Russia

Which of the following is true about noise control A: Domestic noises may be controlled by good manners. B: Industrial noises may be controlled by advancement in technology. C: Transportation noises may be controlled by the concerted efforts of a community. D: All of the abov