单选题According to the Chemical Data Guide，1，3 - pentadiene possesses which characteristic? （）A Colorless liquid，mild aromatic odorB Pale yellow liquid，strong odorC Colorless liquid，faint odorD Straw-colored liquid，sweet-odor

According to Paragraph 4， what puzzles the author is that some bosses fail to

[A] see the link between trust and data protection.

[B] perceive the sensitivity of personal data.

[C] realize the high cost of data restoration.

[D] appreciate the economic value of trust.

A.The Library

B.The Computer

C.Measurement

D.Statistics and Language

According to the conversation, in the chemical fertilizer market, the demand the supply.

Dangerous goods of packaged form and solid form are classified into nine classes according to their ________ ．

A.package forms

B.natures

C.physical properties

D.chemical properties

According to the passage, it is recommended that the heat exchanger side be cleaned by .

A.flushing with chemical solvent without being dismantled

B.brushing mechanically after being disassembled

C.flushing with flesh water only

D.flushing with clean oil only

According to Paragraph 4， what puzzles the author isthat some bosses fail to

A．see the link between trust and dataprotection.

B．perceive the sensitivity of personal data.

C．realize the high cost of data restoration.

D．appreciate the economicvalue of trust.

A、we are going to give the patient a chemical treatment

B、the patient needs a chemical treatment

C、the doctors suggest a chemical treatment of the patient

D、a chemical treatment is necessary

According to Bruce Alberts, science can serve as ________.

[A] a protector

[B] a judge

[C] a critic

[D] a guide

A.Transport

B.Network

C.Session

D.Data Link

Charts are subject to frequent correction according to ______.

A.Notices to Mariners

B.Mariner's handbook

C.Sailing Directions

D.Guide to Port Entry