The answer is B. A only. The optimum valve timing is found through experimentation using an engine dynamometer. The timing of the opening and closing of the valves is called valve timing. So the use of dynamometer measures the power output of a machine that is why it can measure the optimum valve timing.
I think it’s A, but sorry if I’m wrong it just looks like the one. :) Also this is my first time answering a question!
Answer:
All the options below A-D apply.
Explanation:
A) computers and printers allow for the creation of electronic documents. Apps which detect grammatical blunders help to reduce and eliminate grammatical errors thus making the document more concise, lucid and to the point.
B) ICT enables one communicate with anyone, anywhere in the world. With a mobile phone and the relevant apps, it is possible to reach any country via the internet or via the traditional telecommunications systems.
C) Thumb Drive is also known as a Flash Drive or a USB Storage Device. It allows for the storage all types of file/documents. They may be vidoes, audio files, word processed files, etc.
D) Apps can help with procastination.
The can help on to set up reminders about tasks that ought to be done.
Cheers!