?Charcoal retains _____ of the original energy of the wood, making it _____ as a fuel .

A. ?75%-80%; highly efficient 
B. ?approximately 40%; adequate
C. ?approximately 60%; adequate
D. ?20%-40%; highly inefficient


Answer: D

Trades & Technology

You might also like to view...

The vertical scale is exaggerated using a_______ratio.

Fill in the blank(s) with the appropriate word(s).

Trades & Technology

Which type of underground stem used in propagation is solid, and has nodes and inner nodes?

a. Bulbs c. Tubers b. Corms d. Stolons

Trades & Technology

Brer Rabbit tales served as a source of __________

A) religious instruction for slave children B) survival instruction for slave children coming of age in a white world C) simple entertainment for slave children D) gender instruction for young enslaved boys and girls

Trades & Technology

Cargo covers

A) protect people from spilled cargo B) may be a safety requirement in some states C) both answers

Trades & Technology