The phrase "a sufficient knowledge of" is correct and usable in written English.
You can use it when discussing the adequacy of someone's understanding or expertise in a particular subject or field.
Example: "To apply for this position, candidates must demonstrate a sufficient knowledge of data analysis techniques."
Alternatives: "an adequate understanding of" or "a solid grasp of".
Despite this, about 90%% of the participants stated to have a sufficient knowledge of radiation protection issues.
For the proper design of supercritical fluid drug process, it is essential to have a sufficient knowledge of the drug solubilities in supercritical fluids particularly carbon dioxide because of its green characterization.
However, it is only by utilizing the entire gamut of tools and techniques available that we can build a sufficient knowledge of their mode of action to bridge the gap between bench work and bedside treatments.
Once I know where I'm going, and since my pieces often involve technology (at the moment super bright LEDs, laser cutter, and a hacked video projector), I start a long R&D phase, where I test materials to understand their properties and limits, and once I have a sufficient knowledge of the medium, I can then combine the idea and the technique together.
72.3% (= 2,803/3,879) of the students had a sufficient knowledge of these hygienic norms (data not shown).
All participants had a sufficient knowledge of the French language to understand the questions and answer them.
In contrast to those misconceptions, people in this study had a sufficient knowledge regarding the risks of using antibiotics, such as antibiotic resistance and allergies.
In-depth interviews revealed a sufficient knowledge about HIV/AIDS, the effect of antiretroviral drugs and possible consequences of TI in most of the interviewed patients.
Adolescents were included in the study if they were between 12 and 19 years old, had a psychiatric diagnosis, sufficient knowledge of the German language, and an IQ ≥85.
The investigated population could be severely biased, seeing as the users needed a credit card and sufficient knowledge of a foreign language (English) in order to gain access to the pornographic material.
